Estimate time remaining for backup / restores

Use the following SQL to estimate time remaining for active backup / restore jobs within SQL Server:

select    session_id,
    start_time,
    status,
    command,
    percent_complete,
    estimated_completion_time,
    estimated_completion_time / 60 / 1000 as estimate_completion_minutes,    dateadd(n,(estimated_completion_time / 60 / 1000),getdate()) as estimated_completion_timefrom    sys.dm_exec_requests
where    command = 'BACKUP DATABASE'
    or command = 'RESTORE DATABASE'