I have a Nikon Z7 and that's the way I focus: using a Bathinov mask and zoom the (always on) Live View to the max with the screen brightness set to +5.
Note that with the focus point red square centered on the screen you can zoom into full screen zoom (it maintains it's centered spot) and use the screen (with a grid displayed) as the centering preview for telescope based alignment and polar alignment if you want.