systemctl list-timers --all | grep -iE 'apt|unattended|certbot'

list-timers --all shows every systemd timer with its next run time and the unit it triggers; grepping for apt, unattended, and certbot surfaces exactly the maintenance schedule — automatic updates and certificate renewals. If a timer is missing here, that maintenance silently isn't happening. Timers are systemd's modern replacement for cron.