Where’s the global update

Guys can you plz help me for the global I’m on iOS 11 I have a iPad Air 2 but the update isn’t there people are saying that the update was released on Tuesday 10 and now it’s friday the 13th🎃 so plz tell me how

Hello! It’s here, but not fully pushed yet.
You should be able to download it by manually searching for it and updating that way, or uninstall the current version and downloading it again.