I've just updated the Fortran on a Mac page.

In particular

gfortran for ARM Big Sur (macOS 11.0) and Apple Silicon.

NAG Fortran compiler Fortran compiler for Apple Silicon Macs now available to download. Available on Linux, Windows and macOS, including Apple Silicon Macs.

Absoft Pro Fortran 2021 For macOS and OS X. Fully compatible with macOS Big Sur (11.0).