I’m hoping by the end of the year. All of the “difficult” things are finished (control flow, syntax transformers, call/cc, dynamic wind, exceptions, libraries, etc) and it’s just a matter of filling missing base library functions. If there’s something in particular that you need you’re welcome to file and issue or post a message on the discord and I’ll prioritize it.

That being said, Steel is excellent and I highly recommend it if you just need R5RS with syntax transformers