The script will list all RMAN backups that have finished in the last 24 hours and are FULL , you get the status, start time and end time
select
operation,
status,
object_type,
to_char(start_time,'mm/dd/yyyy:hh:mi:ss') as start_time,
to_char(end_time,'mm/dd/yyyy:hh:mi:ss') as end_time
from
v$rman_status
where
start_time > SYSDATE -1
and
operation = 'BACKUP'
and
object_type = 'DB FULL'
order by
start_time desc;