Bitwarden doesn't have a Safari extension anymore since Safari's extensions are their own format... Safari since said they'd allow Chrome's extension api but I haven't heard if Bitwarden will start developing the Safari extension again.
That's not true. If you install it from the Mac App store, you do then get the extension and can activate it within Safari. I just switched from LastPass to Bitwarden and by all accounts it seems better than LastPass (for my basic usage) and the Safari extension is working fine for me.
Thanks for this, by the way. There was a time where the author had announced that he wouldn't be supporting the Safari extension for Catalina and beyond, and I never realized it came back. My work life is better now ;)