Update from Carolyn
I think the male will get ready to leave anytime now especially since Peter mentioned the chick and the male were not really together yesterday this could be a clue that the male thinks the chick is ready to be on its own. Also there has been lots of mention of flight for the chick and it is getting quite late in the season so I am sure the male and the chick are feeling that push. Often the male will leave at the 3 to 4 week mark and we closing in on 4 weeks and the chick will continue to feed until he/she is ready to go!
In the upcoming days it will be important to monitor both the male and chick. Looks like they are becoming more difficult to find. Also note if male is seen with or without chick and how far from chick. Note if chick is flying (in particular distance) and where he is foraging as well as make note of predators in and around area. Make note as well as to whether the birds are going back to perimeter or have abandoned it all together.