Hello there, even though Godot do export for MAC, sadly, Apple made it incredibly hard to port stuff for their platform without owning the hardware and paying a hefty fee just to get the licenses. Godot will refuse to export to Mac without said licenses, so unless the project starts making some serious money eventually on Patreon, I would recomend you trying to emulate the Windows app on MAC (I know someone did it before and it should work).
Sorry about that but right now it's not possible to export a build for MAC OS yet.