From March 2019 onward, Apple will require apps submitted to the App Store to support iOS12 and require screenshots for iPhone XS Max or the 12.9 inch iPad Pro (3rd generation).
You will need to update the information property list (info.plist) with new device requirements when you submit an app update.
The App Store provides customers with apps that work seamlessly with the device capabilities.
For more information about the requirements, please see here.
If you are a Delphi or C++ developer, the Embarcadero 10.3.1 release supports iOS12 and the iPhone X series devices to help ensure that your applications get accepted.