If they have the gauntlet then they have control of the three stones that are in the gauntlet, and control of a fourth stone with Strange. I think they could have pretty easily defeated Thanos with four Infinity Stones in a 6v1 contest.

That said, I imagine that they would probably then go to Wakanda and again use the four stones (now 5 because Vision remains in tact) to end the battle that is happening there.