Can I refrigerate Food Labs buttermilk biscuits for a few hours before baking?

I think it might be better to freeze the biscuits instead of refrigerating them. The frozen/super-cold butter and dairy will make for extra flaky biscuits. You could freeze them on the baking sheet and then transfer them to a sealed plastic bag once frozen-through. Bake as directed (though they may need just a few more minutes in the oven!).