Cell would abuse his Zenkai system to achieve SSB tier power in that time, perhaps far more given how Gohan achieved such in mere hours. #21 would increase her power by eating whatever she could get away with. Perhaps she could also be Cell's sparring partner as well, constantly decapitating him, transmutating the body into a dessert and eating it for the pair of them to make quick gains.
#17 and #18 would likely make no progress in power and just be at their ToP levels. The rest wouldn't make any power increases due to being entirely mechanical (Gero isn't, though his Ki being entirely artificial and being limited by the poor stamina of the older models would stop any progression anyway).
When it comes to the actual tournament, all the fully mechanical androids would be the weakest guys there, so they'd be reliant on #17, #18, #21 and Cell protecting them. Assuming the four decide to work as a team and not just run off after opponents, it'll offer #19 and #20 the opportunity to absorb enough energy from weakened fighters to become viable fighters themselves. #13, #14, #15 and #16 would likely know their place and activate their bombs should there be no other choice. With Cell and #21's broken abilities, they'd likely be gaining huge power ups throughout the ToP's entirety (assuming #21 turning people into food and eating them is allowed) and assuming Jiren or Hit don't knock them out the ring, they'd most likely gain the win for Universe 7 after enough time, though it'd come down to either Cell, #21 or both being the last ones standing.