Adobe Premiere Pro 13.1.4 on Mojave, MacBook Pro 9.1
NVIDIA GPUs on macOS

This information only applies if you have an older iMac (2013 or older), an older MacBook Pro (2014 or older) or an older Mac Pro with an after-market NVIDIA GPU. Modern Apple computers use AMD GPUs and no separate driver updates are required.

For running CUDA with NVIDIA graphics:


You need to be running macOS 10.13.6 (most recent version of High Sierra).
mac0S 10.14 (Mojave) does not currently support CUDA
A current NVIDIA GPU with a minimum of 2 GB of memory
NVIDIA display driver version 387.10.10.10.40.105.


In this case if you don't want to buy new hardware, downgrading to High Sierra would be a better option. 

Sad but True.