SUP Native Mobile Application Development

I have been searching about SUP and ow to develop native app and i have a question

i found out that to develop android SUP native application we do the following steps

1. create MBOs

2. make the relations between them

3. deploy app to server and database

4. generate code as android code and specify the target SDK

then comes the step of developing the android customized code

here comes the question

does SUP role ends by generating MBOs android code ? and now i will develop the native code which represents the business logic from scratch ? so the SUP role is only to connect the application to the SAP backend (server and database)

and what if i want iOS application aswell

so i will generate the code as iOS code and then start the business logic from scratch using iOS and xCode is that right ?

or i am missing something here ?