DMV query to find current executing command of a session

SELECT  er.session_id,
                 er.status,
                 er.command,
                 er.cpu_time,
                 er.total_elapsed_time,
                 sqltext.TEXT
FROM sys.dm_exec_requests er
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS sqltext
where er.session_id = -- Your Session ID here