Separated run around time should do fine. Just make sure they cant reach one another as scared or upset rabbits will find ways to fight through the bars.
Its ok, we all make mistakes sometimes. What matters is that no one was severely hurt and you were able to stop it immediately
For bonding sessions, youll want to start a month or two after Milo is neutered. During this one to two months, you can keep his pen/cage near the other two so that they can all see and smell one another, but cannot reach one another. This will help them get used to having new bunny friends in the home. After the month or two, youll want to do bonding sessions in a neutral space that none of the bunnies have gone in. Most people use their bathrooms because usually bunnies dont hang out in there
Bonding sessions will be fast at first: all bunnies in the neutral space for a minute, then bring everyone back home. Youll do this multiple times a day. Once they can handle a minute without aggression, move to 3 minutes, then 5 then 10, 15, 20, ect. Once they can handle about 4 hours together, you can start bonding them in the free roam area they will share. Again, start with short sessions and move to longer sessions. After they can handle 48 full hours without fighting in their shared space, they can officially live together and can be considered bonded 