Monitor recovery progress in standby db - oracle database script

SELECT to_char(START_TIME, 'DD-MON-YYYY HH24:MI:SS') "Recovery Start Time",
       to_char(item)||' = '||to_char(sofar)||' '||to_char(units) "Progress"
FROM v$recovery_progress
WHERE start_time=
    (SELECT max(start_time)
     FROM v$recovery_progress);