How do you delete achieve log image copies that are already backed up? How do you delete achieve log image copies that are already backed up ?

It seems like below command doesn't work:

delete copy of archivelog all until time 'sysdate-1' backed up 1 times to disk
all and until time does not work together, choose one:

delete copy of archivelog until time 'sysdate-1' backed up 1 times to disk;


or

delete copy of archivelog all backed up 1 times to disk;