They started blooming in April already. I thought that seemed awfully early, but there are still a good number of saguaros beginning to bloom now. That is much more 'normal' for saguaros. The fruit ripens in mid- to late-June when it is nice and hot to go around trying to nudge them off their tall perches (to make saguaro jam).
A bunch of tiny flies hovering in the upper left corner:
Caught a small one blooming, so I stood on the tailgate and reached over to get a shot or two. Caught the unopen bloom here:
Here are three nice ones:
In case you didn't catch the tiny bee in the flower, here's a tight crop of it:
I wish I had better lenses as most saguaros are rather tall and getting good flower pictures is never easy.