Cleveland has won 4 straight. They have 3 with the Twins this weekend, if they sweep (which they very well could considering both Bieber and Clevenger are going in that series), the Twins will be in a tie for 1st place on Monday morning.
The lead is still 4 games, and Cleveland is off today, so even if the Twins lose today vs Washington *and* get swept in Cleveland, we'd still be a half-game ahead on Monday morning. Although I doubt anyone would feel too confident at that point, regardless of a half-game lead!
The earliest the Twins could technically be tied for 1st place would be Tuesday morning.
And Oakland and Tampa are also ahead of Cleveland in the Wild Card. Both of those team by next Tuesday and could very well miss the playoffs entirely.
Oakland is only a half-game ahead of Cleveland (or, 3.5 back of the Twins), and Tampa is only a half-game ahead of them (3 back of the Twins). While it's possibly for a team to make up a 4 game deficit over ~15 games, it's not likely -- and it's even more unlikely that multiple teams would make up a 3-4 game deficit over ~15 games.
Fangraphs still has us 95.2% to win the division, and 99.2% to make the playoffs.