I’m not sure, because I’m not using any update notifier, except the little function I wrote.
But I’m guessing there is an option to turn on graphical notifier somewhere in /etc/eos-update-notifier.conf
EDIT: yes, the option is called “ShowHowAboutUpdates” and if you set it to tray, there will be a little icon in the system tray reminding you that there are updates available.
For more info, see:
https://endeavouros.com/docs/applications/endeavouros-update-notifier/