So T2 SC, has standard SC food, which is pretty decent, self-serve bar with top shelf Hendricks Gin and Grey Goose Vodka, for example. Also Mission Heiffewisen in bottles and other decent items.

T3, the grab and go food is now replaced with more standard, make your own salad bowl. THere's a bar, but everything is free, though more premium quality and usual wells. 4 red wine choices each pretty good. It's much smaller, no showers, and tends to go to capacity (was once denied entry even though I"m a member).

The Delta bus goes T2-T3, T2-TBIT, T3-TBIT. All free for anyone, not just those flying, frequent but yes get on the right bus. Usually the attendant is pretty good at making sure you know which one you are getting on but still reports of people messing it up. BTW, there are some Delta flights that depart out of TBIT gate 133, including domestics at times.

If you have VS Lounge access in T2 (which DL PM/DMs do), of course use that one. It's small and cozy but the made to order food is fantastic (make sure to save room for the miso donuts) as well as the bar selection. (Different than the PP period in the morning). YOu'll have to check the lounge hours on your return flight, I suspect it would be open and can get in if you have access.