Well, (un)fortunately WebGL 2.0 adoption is mainly blocked by Apple. And as Apple is one of the driving forces behind WebGPU, I expect it to be adopted by Safari faster.
Current Safari Technology Preview on Mac actually has a working WebGL2 implementation that's pretty much complete (maybe apart from a few minor issues that need fixing before the switch can be flipped). The whole thing got rebooted quite recently (AFAIK with the help from Google developers), to integrate ANGLE into Safari instead of a 'from-scratch' implementation.