From Mosaic 22.2, bulk delete functionality is available from the configuration tools menu.
In the bulk delete table, the column Step/Casenote/Doc last update shows when worksteps, forms, documents and case notes were last updated on the case.
This, however, will not update for editing or appending group case notes. You should be aware that this may mean the last updated date is not totally accurate and review your processes accordingly, however, we do not anticipate that it will cause major discrepancies, as it is unlikely this would happen without other actions on the case occurring around the same time.
This is in the product backlog for resolution in a future release.