The parents are busy going back and forth with all kinds of grubs, bugs, worms and more.
I also have a Carolina Wren nest going on in a water pitcher that was turned sideways onto of a planter. They find the craziest (yet functional) places to build nests. They are deep inside the pitcher so I can't tell how many there are and don't want to disturb that nest because of its location.
More updates as they develop!