I saw this update. I think they are all but mathematically in
UPDATE:
Salt Lake lost to Portland and failed to clinch a spot.
Portland's win clinched a top-four seed in the Western Conference. Portland will host their first playoff match.
Montréal avoided elimination by defeating Houston.
Atlanta tied with New York. Both teams failed to clinch.
Philadelphia and Nashville clinched a top-four seed in the Eastern Conference because Atlanta-New York tied. Both teams (along with New England) will host their first playoff match.
from MLS website... (thought I posted this earlier)
Race to clinch a postseason berth
EASTERN CONFERENCE
Only three spots remain for six clubs: Atlanta (48 points), Orlando (48 points), New York (47 points), CF Montréal (46 points), D.C. United (44 points) and Columbus (44 points).
New York and Atlanta failed to get the win that would have clinched their place on Wednesday after the two teams played out a goalless draw at Red Bull Arena. Montréal, meanwhile, kept their hopes alive with a 2-0 win over Houston, meaning it all comes down to Decision Day.
Atlanta are best-placed of the six, needing only a point at last-placed FC Cincinnati to be sure of making the postseason. In a winner-take-all matchup, Montréal will host Orlando City. If there's a winner, they're in; if it's a draw, Orlando will make it at Montréal's expense. The Red Bulls travel to second-placed Nashville needing at least a draw to be sure of making it in. Both Columbus and D.C. need to win and hope that other results go in their favor in a big way.
WESTERN CONFERENCE:
Five teams fighting for three playoff places: Minnesota (48 points), Vancouver (48 points), LA (47 points), Salt Lake (45 points) and LAFC (45 points) are still in the mix.
After LAFC and Vancouver drew 1-1 on Tuesday, the Whitecaps need only a draw on Decision Day to be sure of making the playoffs, while LAFC need a win and some help elsewhere
Real Salt Lake's 3-1 home defeat to the Portland Timbers on Wednesday means they missed the chance to clinch a playoff spot with a game to spare and are now on the outside looking in and needing a victory at Sporting Kansas City on Decision Day. That result also clinched Portland a top-four spot.