Optical Zoom on iPhone Xs

I want to record something with 1.8x zoom on iPhone Xs. I have read that optical zoom should be preferred over digital zoom, and Apple says the iPhone XS has 2x optical zoom. 1) Does everything between 1x and 2x (e.g. 1.8x) is optical zoom? Or is only exactly 2x optical? 2) I can't see any indication on the camera app on whether it is using digital or optical zoom. Am I missing it?