I7-8750H is working in Mojave too (i can only recommend, Mojave brings many usefull features).
Almost same boost as under Windows 10. (10% lower CineBench score). Undervolting is working too, and Backscreen after sleep is fixed as well. Iam using Lenovo X1 Extreme. The ony thing iam wonder, export in FinalCut/Premiere using GPU (UHD630) takes twice the time of a MacBook Pro 13,3 with Iris Pro 655. I know, the 655 have 48 Execution Units and UHD630 only 24, but afaik Quicksync speed is not related to amount of EUs.
Somebody knows a reason for that?