If you’re on plasma, give Apdatifier a look. To me, its sole use is to take care of the few widgets I have. But it can:
Description:
Widget that tracks updates and providing notifications for new ones.
Features:
• Notification for new updates and Arch Linux News
• Searching updates for AUR, Plasma Widgets, Flatpak
• Bash script with useful options for managing packages
• Two types of lists: compact and extended with additional information
• Button to initiate a full system upgrade in the selected terminal
• Option to refresh the mirrorlist with the latest mirrors filtered by speed
• Customizable icon on the panel and package icons in the list
• Also should work on non-Arch-based systems (for Plasma Widgets and Flatpak)
After installation, the widget icon should automatically appear in the system tray.