Honestly, there are now over half a million ( 500,000 ) views on the Nvidia sight with Apple users looking for this same Mojave Cuda driver update. We're all stuck in the cold by this. I am using a MBP that came with an Nvidia GPU internally and it wont work properly after the Mojave update same as everyone else. I wouldn't have updated had I known but foolish me I wanted to keep security current and Apple wont update just security like windows does, you have to update the whole OSX which I did.
The good news is I do have first hand knowledge that both Apple and Nvidia are currently working to remedy this situation asap for Mojave. Why it's taking so long I'm not privy to but I was told that both parties want this solved. There is so much more to this story with Metal2 only support after Mojave and Apples planned exclusion of openGL / CL and Cuda acceleration. Basically this means no high end graphic programs will be able to run on a Mac in the future. This is very worrisome indeed.
Its this simple really, Apple is required to support hardware they sell us users so I believe it is coming soon.