Finding Remaining Time using SID

Select
a.sid,
a.serial#,
b.status,
a.opname,
to_char(a.START_TIME,' dd-Mon-YYYY HH24:mi:ss') START_TIME,
to_char(a.LAST_UPDATE_TIME,' dd-Mon-YYYY HH24:mi:ss') LAST_UPDATE_TIME,
a.time_remaining as "Time Remaining Sec" ,
a.time_remaining/60 as "Time Remaining Min",
a.time_remaining/60/60 as "Time Remaining HR"
From v$session_longops a, v$session b
where a.sid = b.sid
and a.sid =&sid
And time_remaining > 0;