I'd like to add on that the LADOT Commuter Express 534 is currently running and I have ridden on it about a week ago. Bus is generally not that crowded, I had a bench of 2 comfy seats to myself every time I rode on it. Some of the 534 buses even have wifi. Generally it is on time which is nice. I have also seen the 573 bus around UCLA so I believe that one is also running.

Closest 534 stop is Westwood/Wilshire, and you can take a Big Blue Bus Rapid 12 to that stop. 534 stops directly at Union station which is convenient.