Judges have lots of experience at (and precedents for) figuring out when employees are on the clock in many contexts, including ones where employees have some d

Judges have lots of experience at (and precedents for) figuring out when employees are on the clock in many contexts, including ones where employees have some degree of ability to select whether and when to accept a given work shift. Guidance does exist. I don't know California law on this specifically, but any state would definitely include time when actively serving as a driver for a ride, many would include time driving to pick up an accepted passenger, some might include time when logged in as a driver.