just voted for this package, hope it finds its way into official repo its flawless

Gnome is slow to respond. It's also not possible to move the icon in the system tray to your desired location

Don't forget to enable the systemd timer to get notified of available updates automatically and periodically:

systemctl --user enable --now arch-update.timer

Don't forget as well to start the systray applet:

arch-update --tray --enable

If your desktop environment doesn't support XDG Autostart, you can enable the associated systemd service instead: systemctl --user enable --now arch-update-tray.service
If you're using a standalone window manager or a Wayland compositor, you can add the following command to your configuration file instead: arch-update --tray

See this link for more details.