The Vikings are one win away from being the only team to play in a Super Bowl at home. However, despite Super Bowl LII being played in U.S. Bank Stadium, they would actually be the "away" team if they make it to the big game. The AFC and NFC alternate between who is the home team and away team each year, regardless of the stadium they play in.
However, the AFC team will get to decide the jersey color they want wear, while the "visitor" a.k.a. the NFC team will get to call the coin toss.