Please show the number of available updates in the tool tip that appears when moving the mouse over the Discover icon in the system tray. Other package managers do this (e.g. Pamac). It's useful for people that use Discover to track updates but still install them through the terminal, as they will not need to open Discover to see how many updates there are.
We used to do this, but ran into constant problems with the number of updates shown in the tooltip being out of sync with the number shown in Discover due to differences in when updates have been checked for between the two, differences in how they count updates, differences in backends, etc. In the end it was easier and less buggy to be more generic. Anyway, the number of updates is ultimately rather meaningless, no? Either there are more than 0 in which you have to go look and see what's available, or it's 0 and there's nothing to be done. In the case of the differences between the extreme cases of "1 update" vs "500 updates", the only thing that "500 updates" tells you is that it's a big update. But you'll notice that anyway when you open Discover or your package manager to see what's available. Maybe there's a new kernel and major system upgrades available, or maybe it's just that all the 527 million LaTeX packages got recompiled against a newer GCC and the number of packages to update isn't communicating a level of risk or danger at all. :)