I was going to Julie , but if my calculations are correct I think they are due to start hatching within the next week or so.
The female has spent most of the last week or so off the nest , the male seems to be the one staying on the nest.
Only guessing here, but Im going to say its because he is so much bigger than the female and can provide more warmth to the nest ??
They are very tame , though the wings are so powerful I try to keep as much distance as I can.