They will be M&S rated, which satisfies the state chain law. Most all truck tires are these days, especially on a 4x4.
You don't get a choice of tire brand from Ford, but that doesn't mean you won't know what you're getting. They are consistent within a model year. So just ask what they will be for the options you are purchasing, or take a look at a similarly equipped truck. It isn't a big mystery to solve.
The FMC order guide gives a great deal of tire info. You can download a copy from any number of sources. A smart buyer always finds that and studies it before ordering a truck.
I always carry chains. In CA, the first stage snow event is as you say, 4x4 with M&S tires or carry chains. Next stage is must have chains. Then must install chains. And lastly, shut down completely for non-emergency vehicles. Best to just have chains ride with you at all times, even if they are just the cheapo cable type.
