The 5th seed, the best non-division winner, plays the worst division winner, the 4th seed. Currently we are 5th and Tampa is 4th, so Dallas plays at Tampa round 1.
Philly, assuming they dont lose their next two games, will clinch the #1 seed and will get a bye round 1 and will play the lowest remaining seed that advances to round 2. So if Dallas beats Tampa and assuming the 6th and 7th seeds both lose, Dallas would play at Philly in round 2.
Dallas still has a very small chance at the #1 seed...........this requires Dallas winning their last 2 games and Philly losing their last 2 games. We also need the Vikes to lose 1 of their last 2 as well. Not very likely but not totally out of the realm of possibility.