I've been periodically watching this blueberry plant through the webcam, hoping to see pollinator visits. I finally saw a bumblebee yesterday, May 9, at 9:20am. (Note the date and time stamp at the top of the webcam photos).
The bumblebee is a big queen, hanging upside down on the far left upper inflorescence. Click on the photo to see a larger version. Her leg is visible on the flowers.
No sign of blue orchard bees on the blueberry flowers in the times that I've watched. In fact, I was beginning to wonder if the flowers are going to be pollinated.