Since Apple released the first beta of iOS 16 after the presentation at WWDC 2022, several weeks and six betas have passed, and it seems that the engineers in charge already have the final version for iPhone readynot for iPad.
Mark Gurman said it in his last newsletter (link): Apple engineers have finished working on the final version of iOS 16, which will be released in the coming weeks. This doesn’t mean that there won’t be new Betas before the public version launch, far from it, since the normal thing is that the Betas that are released have already been prepared for a week or two, so we could still see one or even two betas before the public version
What we’ll take longer to see is iPadOS 16 and macOS Ventura. As has been said for the past few weeks, updates for iPad and Mac will take a bit longer, a delay mainly due to issues with Stage Manager. The new multi-window announced by Apple at its June event still leaves a lot to be desired in terms of functionality and will need to be further refined before the final version is released to the public. Gurman lists October as a possible release date,