How to check if RMAN backup is still running and how much approx time is left to complete

Below script will confirm if the RMAN back up is still running and also confirm approximately how much time is left to complete.

REM How to check if RMAN backup is still running and how much approx time is left to complete

set lines 200

set pages 200

col opname format a40

col module format a30

alter session set nls_date_format='DD-MON-RR HH24:MI:SS';

select  opname,

    sofar,

    TOTALWORK,

    round(sofar*100/totalwork,2) "% Work",

    module,

    p.spid as OS_PROCESS,

    START_TIME,

    LAST_UPDATE_TIME

from    

    v$session_longops lops,

    v$session s,

    v$process p

where   TOTALWORK > 0

and     opname like 'RMAN%'

and     sofar<>totalwork

and s.sid=lops.sid

and s.serial#=lops.serial#

and s.paddr=p.addr;