Re: Twins - supply question
Wow, kudos to you for making such amazing progress! Getting both boys to nurse, and doing so much pumping- you should feel like SUPERMOM! 
The "when" questions are some of the hardest to answer with breastfeeding, because the answer differs so much from woman to woman. For moms with responsive milk supplies, just a few days of nursing and pumping would be enough to get their supplies to match demand. For women who are slower to respond, it could take longer. Maybe even a few weeks?
A lot depends on what your babies are willing to do. If they are nursing well and frequently, then they're going to bring your supply up fast. Any pumping you do after feedings will help, too. But again, it's just impossible to give you a firm answer about how long it's going to take to ditch the bottles and the pump. Though since your boys are managing to have sufficient wet diapers while you're transitioning, I think you have to be close to your goal.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"