Within his video Video demonstration of EoS with KDE Plasma @Beiruty showed of the plasma widget Apdatifier which seems to be not only a simple notification widget, but also includes some additional features to keep your system up to date.
In comparison to the octopi-notifier which I’ve used until now, it also includes a list of the package updates available and in addition to that, you could keep the installed KDE widgets you’re using up to date.
Quite nice, thanks for that find @Beiruty ! And check his video linked in the topic above for further details.
Edit: Sorry @sempterobit I once again used the wrong reply button, didn’t meant to compose a direct reply to your post. Maybe sometime I’ll learn it to use the other buttom down below for general replies…