Can your eyesight ever return from having temporal artiritis?

Unlikely. It's not impossible but it is unlikely. Only 5-15% of patients who suffer visual loss from gca have any improvement in vision at all after the initial insult, and complete recovery is unusual.
Temporal arteritis. Some recovery is possible but sadly, it could be very limited. That is why diagnosing and treating this disease in a timely manner is so critical. Ongoing treatment and monitoring under the care of your doctor can help protect the remaining vision.