Only the screens are up on 2 jumbotrons. They still have to set up the other 2 screens, wire them and program them. They still have The East and West sides of the stadium structure to get up frame wise and that doesn't factor in the extensions over the stands and over the outside of the stadium. Same goes for the north end. They have started the outside extension on the south end but still have a long way to go and need to get up the inside extensions on both ends. Once that is done then they need to paint the entire structure. The roof is basically hundreds of little sheets that need to be attached and sealed in place. Then it needs to be tested to make sure all the seals are sound in the event of wind and rain. All equipment needs to be removed, sand and tarps removed, and new field needs to be put down. The concourse sections under each jumbotron need to finished, painted and set up for the season. Oh, and the new lights need to be installed and the old lights and structures need to be removed.
I am sure there is more that needs to be done but that is what just comes to mind.