You right click on a mailbox, you select New Local Move Request, you go through the rest of the steps and then you wonder.  You can select the Move Request object to see if the process has been completed but with large mailboxes, you're left wondering how far along in the process is the move...

This handy Exchange Command Shell command is very handy --

Get-moverequest –MoveStatus InProgress|Get-moverequeststatistics|select DisplayName,PercentComplete,TotalMailboxSize

The output will reveal:

Display Name
Percent Complete
Total Mailbox Size