HI SueGrace,
The only advice I can really give is to take what you read with a grain of salt as your own nutritionist will give you the diet plan she or he wants you to be on, which (in my experience) is individualized according to your unique situation. For example, some people have said they can have alcohol later down the line, others say they were told not to drink ever after surgery. When I went to my pre-op instructional this week, each of us in the room had different pre-op plans. Mine wanted 4 meal replacement shakes + a bariatric meal (dinner entree) for 2 weeks pre-op. Others in the room had 3 shakes a day and no meals, or 3 shakes a day + 1 meal, etc. It varied based on the person.
As far as the plan of action for foods POST op, I was told for me that when I'm discharged I am on full liquids, then everything changes in 2 week intervals. So, 2 weeks post op I can move to puree, then 2 weeks after that soft foods (assuming I can tolerate it, etc). My nutritionist said if I feel I can do it sooner, that's fine, but it's a base 2 week plan. but again, that's individualized for me. If your nutritionist or doctor said to go a certain route I'd ask questions if you're unsure, but ultimately go with the treatment plan they advise.
Good luck in your journey!