Nvidia should have a driver out shortly. (within 24 hours)
We are otherwise engaged and won't be able to update the driver page right away but it will get done soon after Nvidia posts it.
If you have clicked the "Update" button before having a cup of coffee and are now watching black lines run slowly up the screen as the EFI-only driver runs your very pricey Titan Xp, you have no one to blame but...Apple.
OSX has contained drivers for GTX780 and the first Titan for years. Many years. Many, many years. Apple decided that was enough progress for them and stopped including newer Nvidia cards 2 generations ago. So we play their little "the future has not come...to Cupertino" game with each OS point and Security Update.
For the desperate, the usual tricks should work. Digging thorough old blog posts shows the hex edit way.
But there is a script put forward by a gent named Benjamin Dobell which should work well for this. It allows you to mix and match OS and driver with relative ease. You can also make a mess of your OS if you get a little loose with the terminal. So don't. First one to link to the Github page in the comments gets a gold star! (stop laughing, a gold star is redeemable for 5% off next MVC card !)