It’s probably subjective and also depends on your form when doing the ramp test.
My usual max heart rate is 181 during rides and workouts. When I reach that point, I’m unable to put any more force into the pedals after some time. The only time I exceed that is if I go really hard and drive myself to an all-out in a burst effort, such as during a sprint or a tough climb. In that case I reach 191 but I also want to just fall off the bike afterwards.
In the ramp test I reached 191 in the last interval that I could complete (moved from 181 to 191 in three intervals), then failed immediately on the next tougher interval.
I have to say that I did not have any cooling because I was doing the test without a fan. Workouts have gone significantly better since I have proper cooling, so the peak HR may simply have been a symptom of overheating. I’m looking forward to the next test.