Why update 16 does not come out and I only have 15.7?

You most liekly have a beta version installed, follow the instructions in the lick below.

How to uninstall iOS or iPadOS beta software - Apple Support

Do you have a beta version of iOS 15.7?

If you do have a beta version installed.....it is likely that you do......it would not show up on the screenshot that you posted.