Apparently there are lots of places called "Earth" in the various universes. And no, at the time we visited they had not. They have since, as a millenia has passed. It's still somewhat a backwater even now though.

[At least they're making quick progress and a steady pace. So long as they can avoid any snow angels, it won't take them long other than the blizzard slowing things. At least Loki knows the way.]