I opened control center on 12 pro max there is NO screen mirror option to tap

Did you just open Control Center or did you attempt to customize it? Screen Mirror isn't in Control Center by default but should be available via customize: Edit Control Center on your iPhone, iPad, and iPod touch - Apple Support

Now I don't understand whether you are asking about Screen Mirroring or Screen Recording, but both are available in Control Center but both can be added to Control Center although the method is different. Unfortunately you may need to find someone else to assist you.