I think you should spend the 5 minutes it takes to look at the winget-pkg repo to see how it works. There's lots of great documentation.

All updates are manual, and are done via pull requests. Check everything in-queue: https://github.com/microsoft/winget-pkgs/pulls

Existing versions don't tend to have their metadata updated (I'm not sure winget would accept it). Only new versions are supported.

You can see all the checks that go into cpu-z updates with the latest PR: https://github.com/microsoft/winget-pkgs/pull/349095