“...hoping it’s not all just leafy growth and that there are spuds in there!”
I’d definitely STOP any fertilizing right now - but keep them watered 1-2 times a day, depending upon the heat.
Sounds like a pretty rich mix for potatoes. I’m always mean to mine. They get nothing - NOTHING - from me! ;)
My best potato year was when I dragged some leaf mold from an area I was clearing onto the garden and forked it into my loamy silt. Big perfectly clean potatoes that I harvested by pulling the plants out when not super dry but not wet either. I had Yukon Gold the size of baking russets.