!!!This driver only supports macOS 11 (Big Sur)!!! *See below, 3.24 is available on our website. Notes on public beta driver version 3.23*
USB 3 / 2.0 Driver for macOS 11 Big Sur, Intel / M1 (Apple Silicon) So don't get confused if you still read about 'public preview', 'beta driver' or USB only - all the drivers are officially released meanwhile.
Since then this thread has been the sole resource for all the updates and further development, including the other driver platforms. Info: RME offered a public preview of its USB series driver for macOS 11 Big Sur, Intel and M1 (Apple Silicon), already in October 2020.