Yes! I always polish the occlusals regardless of if there is staining present but I will also ultrasonic if I feel it is needed.
I will ultrasonic or scale the occlusal surface if there is visible calculus/staining. As I’m polishing I will run the prophy cup over all the occlusal surfaces to remove plaque/bacteria.
I will use the ultrasonic when needed on the occlusal surfaces to remove calculus and I always polish the occlusals.