eGPU + iMac 4K (Pro 555) - 2020 Drivers

Hi guys! I’m new here. I‘ve got my 21,5 inch 4K 2017 iMac with a internal Radeon Pro 555 an my external Radeon RX580 working - on the internal display - they work together. I‘ve installed 19.11.1 2019 drivers from bootcampdrivers. Now i want to upgrade to a 2020 driver for better game support. Are you guys already working on it?
Thanks for help!
Stay healthy!