Open the EAC and select %BRAND_OFFICE_365_SHORT% > Recipients > Migration to display the move status for the mailboxes selected ...

Open the EAC and select %BRAND_OFFICE_365_SHORT% > Recipients > Migration to display the move status for the mailboxes selected in the remote move wizard. The value of the Status is Synching during the mailbox move and Completed when the mailbox has successfully moved to your %BRAND_OFFICE_365_SHORT% organization.