How to check the status of log file restore for SQL Server
You can run the following code to see how much longer a backup or a restore will take. It also tells you how long a DBCC checkdb will take and a few other commands as well.


SELECT session_id, command, s.text, start_time, percent_complete, 
CAST(((DATEDIFF(s,start_time,GetDate()))/3600) as varchar) + ' hour(s), '
    + CAST((DATEDIFF(s,start_time,GetDate())%3600)/60 as varchar) + 'min, '
    + CAST((DATEDIFF(s,start_time,GetDate())%60) as varchar) + ' sec' as running_time,
CAST((estimated_completion_time/3600000) as varchar) + ' hour(s), '
    + CAST((estimated_completion_time %3600000)/60000 as varchar) + 'min, '
    + CAST((estimated_completion_time %60000)/1000 as varchar) + ' sec' as est_time_to_go,
dateadd(second,estimated_completion_time/1000, getdate()) as est_completion_time 
FROM sys.dm_exec_requests r
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) s