[arch-general] ssd trim using fstrim.service and fstrim.timer

hello. Per the Arch wiki SSD page, I just enabled sysctl fstrim.timer, and then rebooted. I did not "enable" fstab.service. Now fstrim.timer is loaded, and active (but "waiting") and fstrim.service is loaded, but inactive. And the time stamp file the wiki mentions has a "0" size. So, do I have to wait (A WEEK!) to see if it works, or can I somehow now run fstrim.service manually to at least get it done once? Note: I could just add "discard" to /etc/fstab, but wouldn't that wear out the SSD faster than periodic trimming? And yes, my SSD does support trimming.