We can compare our Mac systems to the blue bar since Cycles only runs on the CPU. So CUDA would already make a huge difference for us and now with RTX the difference is ridiculous. Eevee is GPU supported but I highly doubt an RX5700XT or higher will make a big difference.
For 3D Mac is a no go! Even though I can run games very well so these systems are capable their priority is definitely not supporting 3D artists.
Good luck!