The two nest with a normal schedule have fledged.
Site 3, all five fledged, with 2 leaving some time Sat night (5/28) and the remaining 3 left Sunday night (5/29).
update: the family is near by, and the owners saw the family flying around the yard at dusk today.
Site 8. All were gone by Thursday (5/26) it is unclear how many owlets there were, (at least one).
(edit there are at least 3 owlets possibly 4.)
In both cases the families have not been seen out side of the nest box, roosting. with all the foliage out, it makes it extremely difficult, even on Sunday when 3 owlets were still in the box, mom and 2 owlets could not be located.