SQL-Server: Is there a SQL script that I can use to determine the progress of a SQL Server backup or restore process?

I found this sample script here that seems to be working pretty well:

SELECT 
   r.session_id
 , r.command
 , CONVERT(NUMERIC(6,2), r.percent_complete) AS [Percent Complete]
 , CONVERT(VARCHAR(20), DATEADD(ms,r.estimated_completion_time,GetDate()),20) AS [ETA Completion Time]
 , CONVERT(NUMERIC(10,2), r.total_elapsed_time/1000.0/60.0) AS [Elapsed Min]
 , CONVERT(NUMERIC(10,2), r.estimated_completion_time/1000.0/60.0) AS [ETA Min]
 , CONVERT(NUMERIC(10,2), r.estimated_completion_time/1000.0/60.0/60.0) AS [ETA Hours]
 , CONVERT(VARCHAR(1000), 
      (SELECT SUBSTRING(text,r.statement_start_offset/2, CASE WHEN r.statement_end_offset = -1 
                                                             THEN 1000 
                                                             ELSE (r.statement_end_offset-r.statement_start_offset)/2 
                                                        END)
        FROM sys.dm_exec_sql_text(sql_handle)
       )
   ) AS [SQL]
  FROM sys.dm_exec_requests r 
 WHERE command IN ('RESTORE DATABASE', 'BACKUP DATABASE')