Steelers and Jags, as they both have easy schedules and tiebreaker advantages.
Jax will win both games and have best record of the AFC wild card teams, but even if they lose one of their games (not likely), they are still in, guaranteed. They only need to win 1 of their 2 remaining games.
Chiefs play Chargers this week, so one of them has to lose.
Chiefs and Chargers play Bengals and Broncos next week, so they might be able to pull one out since both Broncs and Bengals are pretty much locks and might rest starters.
Chargers lose out in 1v1 tiebreaker against the Steelers due to their head-to-head loss, but if the Jags lose a game and the Steelers and Chargers win both their games and they end up in a 3-way tie, then Chargers and Jax go because of better Conference records.
If Chiefs win tomorrow, then Steelers are in with 2 wins, guaranteed.
Chiefs are the longest shot. It would require Steelers and Chargers to lose both of their last 2 games, I'm pretty sure.