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I would say it just depends, which I know isn't satisfying as an answer. I shipped an app named Eggy which is all SwiftUI- but it isn't super complex exactly. There are still plenty of simple problems that are hard to get around. But you can definitely use it to replace pieces of an app.

I also shipped an app for a client called Droplii. I definitely believe you can use it for production level apps. Productivity is through the roof. There are just a few small quirks, but I believe the pros out weigh the cons here.

I've shipped a small app in it and am collaborating on another currently. If you're looking to use it on your team I'd wait for this years online WWDC, see whats announced and evaluate from there.