The Gmail app for iPhone and iPad: version 2.0 14 years ago
I couldn't find it in the app store but I did find it by click ing on one of the apps made by Google, then scrolled at the bottom and clicked on > Developer info and it was down the list.
It might be because it's not yet available to all in the App Store yet.
It happens to me some times when I submit an update of an app to the App Store. I get the update a few moments after receiving the "Ready for Sale" status from iTunes Connect but then my partner only got the update in the App Store a few hours later.