@Amey Pimpley This function isn't available yet. One option that is worth testing is to use the storage logging feature to send the logs to Event Hub and monitor when the file is closed.
Example below is a file copy to a file share. Once the file copy completed, the file was closed.
{ "time": "2020-11-06 T20:28:02.9322274Z", "resourceId": "/subscriptions/SubID/resourceGroups/afs/providers/Microsoft.Storage/storageAccounts/SAName/fileServices/default", "category": "StorageWrite", "operationName": "Close", "operationVersion": "3.0", "schemaVersion": "1.0", "statusCode": 0, "durationMs": 5, "callerIpAddress": "IP Address", "correlationId": "35f******1d-00ce-001e-91****00", "identity": {"type":"NTLMv2"}, "location": "West US", "properties": {"accountName":"SAName","etag":"0x8d85f3601523d96","serviceType":"file","lastModifiedTime":"2020/11/06 20:28:02.7964822","serverLatencyMs":5,"operationCount":0,"requestHeaderSize":64,"requestBodySize":24,"responseHeaderSize":64,"responseBodySize":112,"smbSessionId":10151588549518950453,"smbTreeConnectID":5,"smbPersistentHandleID":153771048971,"smbVolatileHandleID":18446744069414584357,
"smbCreditsConsumed":1,"smbMessageID":927,"smbCommandMajor":6,"smbCommandMinor":"FileClose","smbCommandDetail":"Detail=Client","smbFileId":9223503153616388096}, "uri": "\\SAName.file.core.windows.net\afs-westus\StorageSyncAgent_WS2016.msi", "protocol": "SMB", "resourceType": "Microsoft.Storage/storageAccounts/fileServices"}
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Hope this helps!
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