I've just spoken to MVC (MacVidCards) and he has the EFI ready to go on the new Titan Xp. He just needs to test it with the Web Driver when its released next week. Looking good! Here is the link to his blog
http://www.macvidcards.com/blog/nvidia-pascal-coming-to-macs-efi-already-in-the-works
http://www.macvidcards.com/blog/nvidia-pascal-coming-to-macs-efi-already-in-the-works