diff --git a/ydb/core/blob_depot/assimilator.cpp b/ydb/core/blob_depot/assimilator.cpp
index a85de4f9f7b4..4f5f8179486c 100644
--- a/ydb/core/blob_depot/assimilator.cpp
+++ b/ydb/core/blob_depot/assimilator.cpp
@@ -94,6 +94,7 @@ namespace NKikimr::NBlobDepot {
 
         Become(&TThis::StateFunc);
         Action();
+        UpdateBytesCopiedQ();
     }
 
     void TAssimilator::PassAway() {
@@ -116,8 +117,10 @@ namespace NKikimr::NBlobDepot {
             hFunc(TEvTabletPipe::TEvClientDestroyed, Handle);
             hFunc(TEvBlobStorage::TEvControllerGroupDecommittedResponse, Handle);
             cFunc(TEvPrivate::EvResume, Action);
+            cFunc(TEvPrivate::EvResumeScanDataForPlanning, HandleResumeScanDataForPlanning);
             cFunc(TEvPrivate::EvResumeScanDataForCopying, HandleResumeScanDataForCopying);
             fFunc(TEvPrivate::EvTxComplete, HandleTxComplete);
+            cFunc(TEvPrivate::EvUpdateBytesCopiedQ, UpdateBytesCopiedQ);
             cFunc(TEvents::TSystem::Poison, PassAway);
 
             default:
@@ -134,7 +137,11 @@ namespace NKikimr::NBlobDepot {
         if (Self->DecommitState < EDecommitState::BlobsFinished) {
             SendAssimilateRequest();
         } else if (Self->DecommitState < EDecommitState::BlobsCopied) {
-            ScanDataForCopying();
+            if (PlanningComplete) {
+                ScanDataForCopying();
+            } else {
+                ScanDataForPlanning();
+            }
         } else if (Self->DecommitState == EDecommitState::BlobsCopied) {
             Y_ABORT_UNLESS(!PipeId);
             CreatePipe();
@@ -283,7 +290,61 @@ namespace NKikimr::NBlobDepot {
         }
     }
 
+    void TAssimilator::ScanDataForPlanning() {
+        if (ResumeScanDataForPlanningInFlight) {
+            return;
+        }
+
+        THPTimer timer;
+        ui32 numItems = 0;
+        bool timeout = false;
+
+        if (!LastPlanScannedKey) {
+            ++Self->Assimilator.CopyIteration;
+            Self->Assimilator.BytesToCopy = 0;
+        }
+
+        TData::TScanRange range{
+            LastPlanScannedKey ? TData::TKey(*LastPlanScannedKey) : TData::TKey::Min(),
+            TData::TKey::Max(),
+        };
+        Self->Data->ScanRange(range, nullptr, nullptr, [&](const TData::TKey& key, const TData::TValue& value) {
+            if (++numItems == 1000) {
+                numItems = 0;
+                if (TDuration::Seconds(timer.Passed()) >= TDuration::MilliSeconds(1)) {
+                    timeout = true;
+                    return false;
+                }
+            }
+            if (value.GoingToAssimilate) {
+                Self->Assimilator.BytesToCopy += key.GetBlobId().BlobSize();
+            }
+            LastPlanScannedKey.emplace(key.GetBlobId());
+            return true;
+        });
+
+        if (timeout) {
+            ResumeScanDataForPlanningInFlight = true;
+            TActivationContext::Send(new IEventHandle(TEvPrivate::EvResumeScanDataForPlanning, 0, SelfId(), {}, nullptr, 0));
+            return;
+        }
+
+        ActionInProgress = false;
+        PlanningComplete = true;
+        Action();
+    }
+
+    void TAssimilator::HandleResumeScanDataForPlanning() {
+        Y_ABORT_UNLESS(ResumeScanDataForPlanningInFlight);
+        ResumeScanDataForPlanningInFlight = false;
+        ScanDataForPlanning();
+    }
+
     void TAssimilator::ScanDataForCopying() {
+        if (ResumeScanDataForCopyingInFlight) {
+            return;
+        }
+
         STLOG(PRI_DEBUG, BLOB_DEPOT, BDT54, "TAssimilator::ScanDataForCopying", (Id, Self->GetLogId()),
             (LastScannedKey, LastScannedKey), (NumGetsUnprocessed, GetIdToUnprocessedPuts.size()));
 
@@ -324,11 +385,8 @@ namespace NKikimr::NBlobDepot {
                 (EntriesToProcess, EntriesToProcess), (Timeout, timeout), (NumGetsUnprocessed, GetIdToUnprocessedPuts.size()));
 
             if (timeout) { // timeout hit, reschedule work
-                if (!ResumeScanDataForCopyingInFlight) {
-                    TActivationContext::Send(new IEventHandle(TEvPrivate::EvResumeScanDataForCopying, 0, SelfId(), {}, nullptr, 0));
-                    ResumeScanDataForCopyingInFlight = true;
-                }
-                break;
+                TActivationContext::Send(new IEventHandle(TEvPrivate::EvResumeScanDataForCopying, 0, SelfId(), {}, nullptr, 0));
+                ResumeScanDataForCopyingInFlight = true;
             } else if (!ScanQ.empty()) {
                 using TQuery = TEvBlobStorage::TEvGet::TQuery;
                 const ui32 sz = ScanQ.size();
@@ -345,15 +403,18 @@ namespace NKikimr::NBlobDepot {
                 GetIdToUnprocessedPuts.try_emplace(getId);
                 ScanQ.clear();
                 TotalSize = 0;
-            } else if (!GetIdToUnprocessedPuts.empty()) { // there are some unprocessed get queries, still have to wait
-                break;
+                continue;
+            } else if (!GetIdToUnprocessedPuts.empty()) {
+                // there are some unprocessed get queries, still have to wait
             } else if (!EntriesToProcess) { // we have finished scanning the whole table without any entries, copying is done
                 OnCopyDone();
-                break;
             } else { // we have finished scanning, but we have replicated some data, restart scanning to ensure that nothing left
                 LastScannedKey.reset();
-                EntriesToProcess = false;
+                LastPlanScannedKey.reset();
+                EntriesToProcess = PlanningComplete = ActionInProgress = false;
+                Action();
             }
+            break;
         }
     }
 
@@ -365,7 +426,7 @@ namespace NKikimr::NBlobDepot {
 
     void TAssimilator::Handle(TEvBlobStorage::TEvGetResult::TPtr ev) {
         auto& msg = *ev->Get();
-        (msg.Status == NKikimrProto::OK ? Self->AssimilatorLatestOkGet : Self->AssimilatorLatestOkPut) = TInstant::Now();
+        (msg.Status == NKikimrProto::OK ? Self->Assimilator.LatestOkGet : Self->Assimilator.LatestErrorGet) = TInstant::Now();
         const auto it = GetIdToUnprocessedPuts.find(ev->Cookie);
         Y_ABORT_UNLESS(it != GetIdToUnprocessedPuts.end());
         ui32 getBytes = 0;
@@ -389,26 +450,25 @@ namespace NKikimr::NBlobDepot {
                     ++it->second;
                 }
                 getBytes += resp.Id.BlobSize();
-                ++Self->AssimilatorBlobsReadOk;
+                ++Self->Assimilator.BlobsReadOk;
             } else if (resp.Status == NKikimrProto::NODATA) {
                 Self->Data->ExecuteTxCommitAssimilatedBlob(NKikimrProto::NODATA, TBlobSeqId(), TData::TKey(resp.Id),
                     TEvPrivate::EvTxComplete, SelfId(), it->first);
                 ++it->second;
-                ++Self->AssimilatorBlobsReadNoData;
+                ++Self->Assimilator.BlobsReadNoData;
+                Self->Assimilator.BytesToCopy -= resp.Id.BlobSize();
             } else {
-                ++Self->AssimilatorBlobsReadError;
+                ++Self->Assimilator.BlobsReadError;
                 continue;
             }
-            Self->AssimilatorLastReadBlobId = resp.Id;
+            Self->Assimilator.LastReadBlobId = resp.Id;
         }
         if (getBytes) {
             Self->TabletCounters->Cumulative()[NKikimrBlobDepot::COUNTER_DECOMMIT_GET_BYTES] += getBytes;
         }
         if (!it->second) {
             GetIdToUnprocessedPuts.erase(it);
-            if (!ResumeScanDataForCopyingInFlight) {
-                ScanDataForCopying();
-            }
+            ScanDataForCopying();
         }
     }
 
@@ -417,20 +477,20 @@ namespace NKikimr::NBlobDepot {
         Y_ABORT_UNLESS(it != GetIdToUnprocessedPuts.end());
         if (!--it->second) {
             GetIdToUnprocessedPuts.erase(it);
-            if (!ResumeScanDataForCopyingInFlight) {
-                ScanDataForCopying();
-            }
+            ScanDataForCopying();
         }
     }
 
     void TAssimilator::Handle(TEvBlobStorage::TEvPutResult::TPtr ev) {
         auto& msg = *ev->Get();
-        (msg.Status == NKikimrProto::OK ? Self->AssimilatorLatestOkPut : Self->AssimilatorLatestErrorPut) = TInstant::Now();
+        (msg.Status == NKikimrProto::OK ? Self->Assimilator.LatestOkPut : Self->Assimilator.LatestErrorPut) = TInstant::Now();
         if (msg.Status == NKikimrProto::OK) {
             Self->TabletCounters->Cumulative()[NKikimrBlobDepot::COUNTER_DECOMMIT_PUT_OK_BYTES] += msg.Id.BlobSize();
-            ++Self->AssimilatorBlobsPutOk;
+            ++Self->Assimilator.BlobsPutOk;
+            Self->Assimilator.BytesToCopy -= msg.Id.BlobSize();
+            Self->Assimilator.BytesCopied += msg.Id.BlobSize();
         } else {
-            ++Self->AssimilatorBlobsPutError;
+            ++Self->Assimilator.BlobsPutError;
         }
         const auto it = PutIdToKey.find(ev->Cookie);
         Y_ABORT_UNLESS(it != PutIdToKey.end());
@@ -554,7 +614,7 @@ namespace NKikimr::NBlobDepot {
     }
 
     void TAssimilator::UpdateAssimilatorPosition() const {
-        Self->AssimilatorPosition = TStringBuilder()
+        Self->Assimilator.Position = TStringBuilder()
             << "SkipBlocksUpTo# " << (SkipBlocksUpTo ? ToString(*SkipBlocksUpTo) : "<none>") << Endl
             << "SkipBarriersUpTo# " << (SkipBarriersUpTo
                 ? TString(TStringBuilder() << std::get<0>(*SkipBarriersUpTo) << ':' << (int)std::get<1>(*SkipBarriersUpTo))
@@ -562,6 +622,33 @@ namespace NKikimr::NBlobDepot {
             << "SkipBlobsUpTo# " << (SkipBlobsUpTo ? SkipBlobsUpTo->ToString() : "<none>");
     }
 
+    void TAssimilator::UpdateBytesCopiedQ() {
+        while (BytesCopiedQ.size() >= 3) {
+            BytesCopiedQ.pop_front();
+        }
+        BytesCopiedQ.emplace_back(TActivationContext::Monotonic(), Self->Assimilator.BytesCopied);
+
+        Self->Assimilator.CopySpeed = 0;
+        Self->Assimilator.CopyTimeRemaining = TDuration::Max();
+
+        if (BytesCopiedQ.size() > 1) {
+            const auto& [frontTs, frontBytes] = BytesCopiedQ.front();
+            const auto& [backTs, backBytes] = BytesCopiedQ.back();
+            const TDuration deltaTs = backTs - frontTs;
+            const ui64 deltaBytes = backBytes - frontBytes;
+            if (deltaTs != TDuration::Zero()) {
+                Self->Assimilator.CopySpeed = deltaBytes * 1'000'000 / deltaTs.MicroSeconds();
+            }
+            if (deltaBytes) {
+                Self->Assimilator.CopyTimeRemaining = TDuration::MicroSeconds(Self->Assimilator.BytesToCopy *
+                    deltaTs.MicroSeconds() / deltaBytes);
+            }
+        }
+
+        TActivationContext::Schedule(TDuration::Seconds(1), new IEventHandle(TEvPrivate::EvUpdateBytesCopiedQ, 0,
+            SelfId(), {}, nullptr, 0));
+    }
+
     void TBlobDepot::TData::ExecuteTxCommitAssimilatedBlob(NKikimrProto::EReplyStatus status, TBlobSeqId blobSeqId,
             TData::TKey key, ui32 notifyEventType, TActorId parentId, ui64 cookie, bool keep, bool doNotKeep) {
         Self->Execute(std::make_unique<TTxCommitAssimilatedBlob>(Self, status, blobSeqId, std::move(key),
diff --git a/ydb/core/blob_depot/assimilator.h b/ydb/core/blob_depot/assimilator.h
index bd23ea8f86f6..d0e757e5eaee 100644
--- a/ydb/core/blob_depot/assimilator.h
+++ b/ydb/core/blob_depot/assimilator.h
@@ -10,8 +10,10 @@ namespace NKikimr::NBlobDepot {
         struct TEvPrivate {
             enum {
                 EvResume = EventSpaceBegin(TEvents::ES_PRIVATE),
+                EvResumeScanDataForPlanning,
                 EvResumeScanDataForCopying,
                 EvTxComplete,
+                EvUpdateBytesCopiedQ,
             };
         };
 
@@ -42,6 +44,12 @@ namespace NKikimr::NBlobDepot {
         bool ActionInProgress = false;
         bool ResumeScanDataForCopyingInFlight = false;
 
+        std::optional<TLogoBlobID> LastPlanScannedKey;
+        bool PlanningComplete = false;
+        bool ResumeScanDataForPlanningInFlight = false;
+
+        std::deque<std::tuple<TMonotonic, ui64>> BytesCopiedQ;
+
     public:
         static constexpr NKikimrServices::TActivity::EType ActorActivityType() {
             return NKikimrServices::TActivity::BLOB_DEPOT_ASSIMILATOR_ACTOR;
@@ -62,6 +70,8 @@ namespace NKikimr::NBlobDepot {
         void Action();
         void SendAssimilateRequest();
         void Handle(TEvBlobStorage::TEvAssimilateResult::TPtr ev);
+        void ScanDataForPlanning();
+        void HandleResumeScanDataForPlanning();
         void ScanDataForCopying();
         void HandleResumeScanDataForCopying();
         void Handle(TEvBlobStorage::TEvGetResult::TPtr ev);
@@ -74,6 +84,7 @@ namespace NKikimr::NBlobDepot {
         void Handle(TEvBlobStorage::TEvControllerGroupDecommittedResponse::TPtr ev);
         TString SerializeAssimilatorState() const;
         void UpdateAssimilatorPosition() const;
+        void UpdateBytesCopiedQ();
     };
 
 } // NKikimrBlobDepot::NBlobDepot
diff --git a/ydb/core/blob_depot/blob_depot_tablet.h b/ydb/core/blob_depot/blob_depot_tablet.h
index 726ebafc598e..1b59fc81ec00 100644
--- a/ydb/core/blob_depot/blob_depot_tablet.h
+++ b/ydb/core/blob_depot/blob_depot_tablet.h
@@ -290,17 +290,24 @@ namespace NKikimr::NBlobDepot {
         TActorId GroupAssimilatorId;
         EDecommitState DecommitState = EDecommitState::Default;
         std::optional<TString> AssimilatorState;
-        TString AssimilatorPosition;
-        TInstant AssimilatorLatestErrorGet;
-        TInstant AssimilatorLatestOkGet;
-        TInstant AssimilatorLatestErrorPut;
-        TInstant AssimilatorLatestOkPut;
-        TLogoBlobID AssimilatorLastReadBlobId;
-        ui64 AssimilatorBlobsReadOk = 0;
-        ui64 AssimilatorBlobsReadNoData = 0;
-        ui64 AssimilatorBlobsReadError = 0;
-        ui64 AssimilatorBlobsPutOk = 0;
-        ui64 AssimilatorBlobsPutError = 0;
+        struct {
+            TString Position;
+            TInstant LatestErrorGet;
+            TInstant LatestOkGet;
+            TInstant LatestErrorPut;
+            TInstant LatestOkPut;
+            TLogoBlobID LastReadBlobId;
+            ui64 BytesToCopy = 0;
+            ui64 BytesCopied = 0;
+            ui64 CopySpeed = 0;
+            TDuration CopyTimeRemaining = TDuration::Max();
+            ui64 BlobsReadOk = 0;
+            ui64 BlobsReadNoData = 0;
+            ui64 BlobsReadError = 0;
+            ui64 BlobsPutOk = 0;
+            ui64 BlobsPutError = 0;
+            ui32 CopyIteration = 0;
+        } Assimilator;
 
         class TGroupAssimilator;
 
diff --git a/ydb/core/blob_depot/mon_main.cpp b/ydb/core/blob_depot/mon_main.cpp
index 051be4245bf3..eb6b4d74fa00 100644
--- a/ydb/core/blob_depot/mon_main.cpp
+++ b/ydb/core/blob_depot/mon_main.cpp
@@ -456,19 +456,24 @@ namespace NKikimr::NBlobDepot {
                             KEYVALUE_P("Now", TInstant::Now());
                             KEYVALUE_P("Decommit state", DecommitState);
                             KEYVALUE_P("Assimilator state", GroupAssimilatorId ? "running" : "stopped");
-                            KEYVALUE_P("Assimilator position", TStringBuilder() << "<pre>" << AssimilatorPosition << "<pre/>");
+                            KEYVALUE_P("Assimilator position", TStringBuilder() << "<pre>" << Assimilator.Position << "<pre/>");
                             KEYVALUE_P("Last assimilated blob id", Data->LastAssimilatedBlobId ?
                                 Data->LastAssimilatedBlobId->ToString() : "<null>");
-                            KEYVALUE_P("Last read blob id", AssimilatorLastReadBlobId);
-                            KEYVALUE_P("Latest successful get", AssimilatorLatestOkGet);
-                            KEYVALUE_P("Latest erroneous get", AssimilatorLatestErrorGet);
-                            KEYVALUE_P("Latest successful put", AssimilatorLatestOkPut);
-                            KEYVALUE_P("Latest erroneous put", AssimilatorLatestErrorPut);
-                            KEYVALUE_P("Blobs read with OK", AssimilatorBlobsReadOk);
-                            KEYVALUE_P("Blobs read with NODATA", AssimilatorBlobsReadNoData);
-                            KEYVALUE_P("Blobs read with error", AssimilatorBlobsReadError);
-                            KEYVALUE_P("Blobs put with OK", AssimilatorBlobsPutOk);
-                            KEYVALUE_P("Blobs put with error", AssimilatorBlobsPutError);
+                            KEYVALUE_P("Copy iteration", Assimilator.CopyIteration);
+                            KEYVALUE_P("Bytes to copy", Assimilator.BytesToCopy);
+                            KEYVALUE_P("Bytes already copied", Assimilator.BytesCopied);
+                            KEYVALUE_P("Copy speed, bytes per second", Assimilator.CopySpeed);
+                            KEYVALUE_P("Copy time remaining", Assimilator.CopyTimeRemaining);
+                            KEYVALUE_P("Last read blob id", Assimilator.LastReadBlobId);
+                            KEYVALUE_P("Latest successful get", Assimilator.LatestOkGet);
+                            KEYVALUE_P("Latest erroneous get", Assimilator.LatestErrorGet);
+                            KEYVALUE_P("Latest successful put", Assimilator.LatestOkPut);
+                            KEYVALUE_P("Latest erroneous put", Assimilator.LatestErrorPut);
+                            KEYVALUE_P("Blobs read with OK", Assimilator.BlobsReadOk);
+                            KEYVALUE_P("Blobs read with NODATA", Assimilator.BlobsReadNoData);
+                            KEYVALUE_P("Blobs read with error", Assimilator.BlobsReadError);
+                            KEYVALUE_P("Blobs put with OK", Assimilator.BlobsPutOk);
+                            KEYVALUE_P("Blobs put with error", Assimilator.BlobsPutError);
                         })
                     }
                 }