I am on a M1 MacBook Air with 8 GPU cores. In Boralus with the settings shown below, I get between 50-70 FPS. If I go inside the building with the ethereals, it jumps up to 100-110 FPS.
Personally, my highest preference when playing WoW is high resolution. My next priorities are texture res (high), liquid detail, particle density, depth effects, and outline mode (all good or better). All the while, my goal is to keep FPS at 60 or higher. Typically, on a MacBook with a dGPU, I can do this but it comes at the cost of the fans going nuts. On a Mac without a dGPU, it wasn't even possible. It is a bit odd now to be able to fire up WoW and have decent settings for a laptop and not hear anything. The laptop gets a bit warm but not more than pleasantly so. I am thoroughly impressed with the new M1 MacBook Airs. I have a M1 MacBook Pro that I am about to start playing with a well. We'll see if it is any better.