KFC had Impossible chicken nuggets for a time, but they've since removed them from their menu. They're still available in the freezer section at Walmart here.
McDonald's tested a "McPlant" burger that IIRC had a Beyond Burger patty in certain markets (mostly in Europe), but I've never seen it come to this area.
But in my experience, Impossible (Burger King/Hungry Jack's product) is by far a better product than Beyond. When browning the product (I like to make vegetarian dirty rice and have this Mexican concoction I make with Impossible beef, rice, taco seasoning, and red chili pepper), it browns more naturally and doesn't have an aftertaste like Beyond does.