They are a mix of early morning, afternoon and evening. A little trick is to look at the anthers. If they are closed then it's a morning shot, my first walk with the camera is around 8am. Fluffy pollen is usually around 10 - 10:30 here. If the pollen is gone it means an evening image and the bees had a good day. If the stamen is gone....it means I had a good day