https://wccftech.com/download-ios-15-ipados-15-final/

You can now go ahead and download iOS 15 and iPadOS 15 final update on your iPhone 12 Pro Max, iPhone 11, iPhone X, iPad Pro, iPad Air and more.

The wait is finally over. iOS 15 and iPadOS 15 is sitting on Apple's servers right now and anyone can go ahead and download it as long as they have a compatible iPhone and iPad. But to keep things nice and short, if your device is running iOS 14 or iPadOS 14, then you will definitely get the latest update.