How to support the Super Retina display of iPhone X

I note that Apple release new Policy that since July 2018, all iOS app must support the Super Retina display of iPhone X.


We are planning to update app to support iPhone X until July, but we don't clear the detail criteria of iPhone X support.

Could you please give me some information?

I have check this page, https://developer.apple.com/ios/update-apps-for-iphone-x/


Another question is

to support iPhoneX screen, is check the safe area on Storyboard is required?