My team can crank out high quality work in a few hours and AI could do the same medium to high quality work in a minute or two, but the review, feedback, and sign off takes days of back and forth. AI just slows this part of the process down because editing AI work is often a challenge because, no one is quite as familiar with how it was put together and sometimes it creates things that are not editable at all. And telling AI to make very specific changes is often a mixed bag at best.
Solo devs and small teams with minimal oversight can probably move a lot faster, but corporations are going to see minimal uplift except in areas where no one is looking.