CONGRATULATIONS!!I was searching for one with turf or industrial tires. Not sure which will be best. The dealer the owner bought it from is open to a swap/trade on these. So I will start with these and see how it does.
I don't have that large of a tractor and am new tractoring so the following may therefore not apply:
I have two sets of wheels, you might look into the price of a new set as the tire on the rim can cost less than just the tires according to comments in other threads. If the price is reasonable you could then run the current set like you're planning and buy a second set if you find the need later on.