Summary: Use Windows PowerShell to pull statistics about user migrations.

 How can I use Windows PowerShell to easily display a report with the time and amount of data transferred with
           my staged migrations?

 Use the Get-MigrationUser and Get-MigrationUserStatistics cmdlets and access some key properties,
           for example:

Get-MigrationUser | Get-MigrationUserStatistics |
Select-Object SyncedItemCount,TotalInprogressDuration,BytesTransferred,AverageBytesTransferredPerHour