I've been using my iPhone (8?) with a Clean Camera app and a lighting to HDMI adapter into a MiniPro. I would say that it is currently "getting me by". At any sort of zoom and the iPhone gets pretty grainy. Also, today I noted that we have a pretty major video delay between the iPhone and our other camera (GoPro 7). I know people tend to have a host of issues with GoPros but in this case I suspect the iPhone as the culprit as I've read that its the lightning adapter that is actually generating the HDMI signal from the data streaming out of the phone. I would think that adding wireless to the phone feed would only make things worse, but maybe airplay through an AppleTV would introduce less latency?
Only noticed the delay today as we had to do much more camera switching as the guest pastor liked to "wander" and our regular pastor is pretty happy to stick to the pulpit.
In full transparency I have the GoPro on an HDMI Cat6 extender, but again, I think my latency is coming from the Phone. Also fun to note, I tried to run the phone over the Cat6 extender and the ATEM was not having it... I'm sure its something to do with HDMI standards and what not. I don't remember this being this complicated 20 years ago doing community cable TV in my highschool....