I want to make sure you're referring to the 2018 season, and not the 2017 season Super Bowl which is contested in February 2018. If you are looking two seasons ahead, then flippersrevenge is correct, nobody will have it. The only 2018 odds you might find are World Cup futures.
However, if it's next season you are talking about, then those odds will be available at limited spots. I'm not in Las Vegas full time anymore otherwise I could point you to a specific spot. There are only so many separate odds available anymore, with all the mergers. Your friend could try Westgate (formerly Las Vegas Hilton), Wynn, any of the Cantor Gaming locations, any of the William Hill locations, any of the Station Casino locations, any of the MGM Mirage locations, any of the Harrah's locations, or any of the Coasts properties. Not many casinos have their own independent sportsbook lines anymore. I can think of Treasure Island, South Point, and maybe Stratosphere.
On edit: after reading your post more carefully I see you are referring to next season. Yeah, that will be available. I'm not sure about conference odds but Super Bowl will be up. Westgate is always a good place to try. But keep in mind not everything will be on the board. Not enough space. Your friend will have to check the futures betting sheets which are in a rack to the right of the sportsbook betting windows.
You can check the bottom of this link to get an idea of what odds will be available for each team:
http://www.vegasinsider.com/nfl/odds/futures/