What usually happens is that around 9/10 months most bottle fed babies drop to 3 bottles and then 2 bottles around 1 year. The most common pattern seems to be wake up bottle, breakfast, nap, lunch, pre nap bottle, nap, tea, bedtime bottle.
Ideally they should be off bottles around 1 but in reality the morning bottle gets moved to milk in a cup with breakfast some time between 12 and 18 months and the bedtime bottle tends to be the last to go, and that really varies!
I am very impressed that you are pumping that much milk!
Laura