T-SQL to identify long running queries

Below queries helps to identify long running query and hanging queries:

USE MASTER
GO
SELECT SPID,ER.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,

/* End of Article Code */

ER.command,ER.blocking_session_id, SP.DBID,LASTWAITTYPE, 

DB_NAME(SP.DBID) AS DBNAME, 

SUBSTRING(est.text, (ER.statement_start_offset/2)+1,
((CASE ER.statement_end_offset
WHEN -1 THEN DATALENGTH(est.text)
ELSE ER.statement_end_offset
END - ER.statement_start_offset)/2) + 1) AS QueryText,
TEXT,CPU,HOSTNAME,LOGIN_TIME,LOGINAME,
SP.status,PROGRAM_NAME,NT_DOMAIN, NT_USERNAME
FROM SYSPROCESSES SP
INNER JOIN sys.dm_exec_requests ER
ON sp.spid = ER.session_id
CROSS APPLY SYS.DM_EXEC_SQL_TEXT(er.sql_handle) EST
ORDER BY CPU DESC

// This code has been referred from an article.