IGNITE-19034 VisorSnapshotStatusTask returns empty result for restoring snapshot until snapshot check is completed

docs/_docs/snapshots/snapshots.adoc

@@ -289,35 +289,36 @@ control.(sh|bat) --snapshot restore snapshot_09062021 --increment 1
 
 == Getting Snapshot Operation Status
 
-The status of the current snapshot operation in the cluster can be obtained using the `control.sh|bat` script or JMX interface:
+The status of current snapshot operations in the cluster can be obtained using the `control.sh|bat` script.
+
+Snapshot operations include:                                                                                                                                                                                                                                  │
+* `Create` - Full or incremental snapshot creation
+* `Restore` - Cache group restoration from snapshot
+* `Check` - Snapshot consistency verification (parallel execution allowed)                                                                                                                                                                   │
 
 [tabs]
 --
 tab:Unix[]
 [source,shell]
 ----
-# Get the status of the snapshot operation.
+# Get the status of snapshot operation.
 control.sh --snapshot status
 ----
 
 tab:Windows[]
 [source,shell]
 ----
-# Get the status of the snapshot operation.
+# Get the status of snapshot operation.
 control.bat --snapshot status
 ----
-
-tab:JMX[]
-You can also get the current snapshot status via the `SnapshotMXBean` interface:
-[source,java]
-----
-SnapshotMXBean mxBean = ...;
-
-// The status of a current snapshot operation in the cluster.
-String status = mxBean.status();
-----
 --
 
+ [NOTE]                                                                                                                                                                                                                                                        │
+====                                                                                                                                                                                                                                                          │
+Parallel and multiple snapshot check operations can be running concurrently with any other snapshot operation.
+But only one check for one snapshot. Create and restore operations cannot run in parallel  - only one of each type can
+be active at a time. The status is printed for each running snapshot operation (if multiple) separately, one after another.
+
 == Cancelling Snapshot Operation
 
 To abort create/restore snapshot operation you need to obtain an `operation request ID`.