Are you new to cats ;) cat body clocks are interesting to me as I lived in a farm with semi ferals, and they would know when we got back from school and those that wanted fuss came to us and those that wanted food came when we fed them every few days.
Ours gets 4x small meals per day- 2x wet, 2x dry. Her internal body clock is accurate to within 5mins. It’s pretty impressive actually.