Anyone know approx how much it cost to have cylinder head machined ?

It mostly depends on the condition of the head, the possibility that the head can be machined at all (or not), what kind of machine work needs to be done, what the regional market and demand is for that kind of thing, what materials and technology we are talking about in the head, if they are going to disassemble or not, and the quality of the machine shop.

Is this for the Verano?

Yes, For Verano.

Resurface only is an hour or hour and half.

That Verano was out of time or hydro locked or something. I'll be surprised if the head came through without any damage.