Much less active than it used to be when it was run by Hector Martin. The core development is a lot slower. Although the graphics stack, for instance, has reached a very mature state recently.
> Is it ready as a daily driver?
It depends. Only M1 and M2 devices are reasonably well-supported. There is no support for power-efficient sleep, Display Port, Thunderbolt, video decoding or encoding, touch ID. The speakers overheat and turn off momentarily when playing loud for a longer period of time. The audio stack in general had to be built from ground up and it seems to me like there are bits and pieces still missing or configured sub-optimally.
> Is it getting support from Apple?
Not that I am aware of.
> are they (Apple) hostile to it?
Not to my knowledge.
> Are there missing features?
Plenty, as described above. There has been some work done recently on Thunderbolt / Display Port. Quite a few other features are listed as WIP on their feature support page.
> Can I run KDE on it?
Of course. KDE Plasma on Fedora is Asahi Linux's "flagship" desktop environment.