1. $ systemctl status fstrim.timer
  2. ● fstrim.timer - Discard unused blocks once a week
  3. Loaded: loaded (/etc/systemd/system/fstrim.timer; enabled; vendor preset: disabled)
  4. Active: active (waiting) since Sun 2019-09-22 08:16:24 IST; 11min ago
  5. Trigger: Mon 2019-09-23 00:00:00 IST; 15h left
  6. Docs: man:fstrim
  8. Sep 22 08:16:24 home systemd[1]: Started Discard unused blocks once a week.