Although Macadamias are flowering they are of limited benefit to honey bees.
I was asked the other day if a Tuckeroo Tree was good for bees. Apparently the bees were 'roaring' in the tree. If bees are 'roaring' they are gathering pollen. The pollen is collected by the mouth parts and then they hover whilst they rake it back to the pollen baskets. It is this hovering of large numbers that makes the roar. Nectar gathers on the other hand go sip, sip, and straight to the next flower.