With just days to take bets before March Madness begins, the state’s licensed sportsbooks are looking at a potential wagering windfall in the hundreds of millions after mobile betting goes live tomorrow.

“The difference between states with mobile and states with just in person is gigantic; at least 10 to one and maybe more so,” Professor Victor Matheson, an economist at the College of the Holy Cross, told the Herald. “It was fun when we opened up gaming at the casinos, but the real sports betting in Massachusetts happens on Friday when we open mobile gaming.”

After years of waiting, sports fans in Bay State will soon have over half-a-dozen ways to legally place a wager on professional and college contests from the comfort of their couches.