The following text on the OpsHub Migration Utility page indicates that the username and timestamp will be embedded in the comments of the migrated changeset.
Metadata information about the source Change set like original username, original check-in timestamp are embedded in Change set comments during migration for Change sets. https://visualstudiogallery.msdn.microsoft.com/28a90a17-d00c-4660-b7ae-42d58315ccf2
Why am I not seeing this metadata embedded in the changeset comments?