Steffo 
so... apparently I can now update my Ticwatch Pro 3 Ultra to WearOS 3?
well... looks like Mobvoi had a *small* delay of about... 1.5 years. Whoops. (They said WearOS 3 will become available in the second half of 2022..)
Well, at least I get finally an update! The last security update the watch has seen is apparently from october 2021. 
I'm gonna try it this evening and hopefully get it working!