Oxygen Levels

Hi
Looking for advice, my Dad has been a smoker for 40+ years and stopped after a 2nd heart attack and COPD diagnosis in May 2025. He was at a physio and heart function clinic yesterday but his oygen levels even whilst on a bike where high. They stayed at 97%-98% the lowest dip was 93% and that was with talking and cycling at the same time. This was also after forgetting his Fostair inhaler in the morning (exercise was 12pm).

I was advised his oxygen should never be above 93% and that is what we have been looking for when he is ill with a cold etc. Would this mean that I should be worried if he does get to 93%?