A it ok to eat a whole deli flat with tuna salad on it for lunch 6 months post op?

Or should I just be eating half of a deli flat still

no one can tell you whether it is "okay" or not. Are you counting calories? Protein? Carbs? Does this meal fit into your diet? Do whatever you feel is right, are you still trying to lose or just maintain? My notion is that if you exercise you can probably eat whatever you want with the sleeve. Just limit your portions. If you can eat the whole thing and it;s not 1200 calories, then do it. If you don't think you should, then split it.