I have used flang successfully on Apple Silicon, but flang/f18 itself doesn't come with a Fortran runtime (it uses pgf90 by default) and as of now, there is no compatible Fortran runtime to generate executables. Anyone able to troubleshoot this yet?
eldinidle
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Keep an eye here for developments https://github.com/Homebrew/brew/issues/7857
You'll want to follow the gcc support, which is just starting with gmp getting support for Apple Silicon. I can't imagine Apple Silicon not having a compatible fortran compiler, considering you can use gfortran with other AArch64 targets.