I have been looking into the caravel-sim-infrastructure repository. I noticed that there was a directory for a UVM sim (where that would be developed,) has any work gone into this?

UVM work is actively under development by the Efabless team in Egypt. You can ask @Kareem Farid (I think he is the main one working on it).

@Spencer Bowles UVM for caravel isn't available yet. We have started to do some verification using uvm-python. It's not sv and not directed to caravel. it's for verifying any ip that can be integrated into soc. Please do reach out if you have any future questions at all.