not much of a turner, need some help with drying some spindle pieces

I'm an experienced woodworker but not much of a turner. I don't have experience working with green wood. I have a lathe but rarely use it and when I do it's to make parts for other things, usually knobs or legs. I'm building a desk that needs 4 legs 6 inches tall tapered from 2.5 to 1.5 inches. I know how to turn that part. No big deal.

But I didn't want to buy a board of 12/4 ash just to get these little legs so I bought a turning blank, but it came sealed so I assume green.

These legs need to have big lab bolts in the middle so I need to consider shrinkage around those fasteners.

I have a ceramics kiln I can control precisely to use to dry the block. My question is: Should I cut it into rough pieces and dry them or should I turn the pieces green and then dry? Or should I just go back to my supplier and see if I can get an offcut of kiln dried 12/4?