Often see them mousing open ground between 11am and about 3pm, then they disappear until night. I think they know the coyotes are out-of-service usually in that timeframe, and their time can be better spent mousing, and not defending or competing for food, running, etc. When the weather turns colder that mid-day window will shorten, and be they come out in the warmest part of the day, to greet any mice, moles, rabbits, etc that adhere to the same schedule.
Come to think of it, Ive only killed two at night. All the others were in early afternoon.