Through below script you are able to find out Which Connection Is Doing What in SQL Server at current point of time.
SELECT des.session_id, des.host_name,des.host_process_id, des.total_elapsed_time, (select text from sys.dm_exec_sql_text(r.sql_handle)) as command FROM sys.dm_exec_sessions AS des left join sys.dm_exec_requests AS r on r.session_id = des.session_id where des.status ='running'order by command
you will get the output like below:-