Just as one reference point, for my mobile app, it took me 6 months of approximately full time workload to get it ready to submit the initial release.

In the beginning I was using GPT-5.4 in April.

I can't speak to what other devs are building, and there's certainly no lack of people pushing out slop made in a weekend.

Companies and teams with code review are not adapting at the same speed.

I figure it will take a few additional months for the benefits to become more noticeable to end users.

As someone working on the frontier, so to say, I believe I have a better picture.