Below commands will helpful for deleting expired archivelog files through RMAN :

RMAN>list expired archivelog all;

RMAN>crosscheck archivelog all;

RMAN>delete noprompt expired archivelog all;

Now check the output with below command it should not return any list

RMAN> list expired archivelog all;
using target database control file instead of recovery catalog
specification does not match any archived log in the repository
RMAN>