Unfortunately, the ntp recipe puts that cron entry in the wrong file.

Per-user crontabs should actually be in /var/cron/tabs. So copy that file to /var/cron/tabs/root and see that should fix it.

You can also run ‘crontab -l’ to see a list of currents jobs for the user you are logged in as. ‘crontab -e’ will let you edit the entries directly using vi.