Support for M1 GPU is more than unlikely. The current Blender Cycles has dropped openCL and CUDA for macOS, means no support for any GPU. AFAIK there are no plans to port Cycles to Metal and since SuperFly is based on Cycles, there will be no version for M1 GPU. Maybe in a few years when Blender has been ported to Vulkan we will see support for metal in Cycles.