Congrats on your new buns! It sounds like they have a very loving home
Their diet sounds good, most recommend keeping rabbits on a hay and pellet diet until they are at least 3 months of age before slowly introducing vegetables. When you do introduce vegetables, do it slowly: one new veggie a week to make sure they tolerate it well (no change in poops or behavior).
Unfortunately, A&B is right, you will have to separate them soon 
by 3 months, rabbits begin to be hormonal and you could risk a nasty fight that would make them hate eachother permanently. On another thought, young rabbits are commonly mis-sexed even by experts, so if one is a male you could end up with an oops litter! After they are spayed and a month has passed they can be re-bonded. Check out the bonding section of this forum for tips!
Again, welcome to rabbit ownership
They really are very rewarding pets. My rabbit brings me a lot of joy <3