Whens it gonna be compatible for 1.19?

Never, the creator was fatally killed to death next week.
All jokes aside, probably in about a week or less

Just wait, it will be available soon.

1.19 PR:
606f9c5#diff-e380ecaaf1e9f72be30db395ad3f313674c314672bd1dbdf01362b582475a7cf

1.19 branch (unofficial):
https://github.com/wagyourtail/baritone/tree/1.19/1.19