while in theory there are arm things available on various package repos, in practice I've hit a good amount of stuff not packaged yet (in my case, the context was more around people doing stuff via docker M1)
Alpine, Debian and Arch have never given me a miss regarding packaging for arm64/hf. And I work specifically with embedded Linux using those distros as a base.
Is this current info? On the various projects I find myself working on (usually web-related across a few different stacks) I don't really run into any without an ARM64 version.