Yes, in the Steam version and in the Epic Games Store version it is in the game now. The mode will continue evolving and getting better. Stay tuned for updates and improvements to the mode after the console release.
Xbox and PlayStation also received vertical orientation mode with the April 13 update. Finally an opportunity to use the rotation feature on your living room TV mount!
Please find a dedicated FAQ for all things cab mode here: https://www.pinballfx.com/?page_id=7754.