Hi! I'm in NJ as well and am preparing to do battle as today will be the hottest day and I think the girls (and 3 boys) are already stressed from the intense heat with no breaks from the last 3 days.
I got them a small wading pool that attaches to the hose which creates a ring of sprinkling water around the edge
They haven't exactly used it themselves, although they get pretty close to it ........unfortunately only to glare at it in distrust

I have gently forced a few hens in yesterday when I thought they were getting a little too hot to cool off their wings and bellies.
I also spray their run with cold water which actually does make a noticeable difference.
I've been giving them various frozen treats and hang frozen gallon bottles in the path of a fan in their coop overnight.
I do unfortunately have 5 broody hens right now that will not leave the coop. I constantly bring them cold water and have to physically remove them from their boxes and place them directly next to the water which they always start drinking immediately. I swear they wouldn't get off themselves without my help and would just roast and roast in there until they cooked.
I might have to bring a few girls in today, I think a few are walking a fine line between just really hot and dangerously hot. I have a 10 year old hen named Angel, who is literally turning grey but takes the heat better then a few if the younger hens.
My chickens all came into my care kinda messed up already and I'm forever battling SOMETHING with them, so worry extra in the heat. I think this is the only instance where I would actually prefer the NJ winter temps for their sakes. The high heat really takes a toll on my sweet tiny raptors.
In the end though, we're much better off the the folks over I'm Washington...I do hope they're all hanging in there.