Glad things seem to be going well!
I think the best way to move forward with bonding is:
1. Neutral Territory until they seem to get along
2. Semi- Neutral Territory until they seem to get along
3. Cementing, together in what will be their new home, if this is in a territorial area deep clean and re-arrange it first. This is the most grueling for the human as it requires constant supervision for 24-48 hours. Once they seem to get along in their new home for 24-48 hours without fighting then I would consider them bonded.
This process happens at a different pace for each group of bunnies. You want to be careful not to push them too much too quickly as it can cause setbacks. Sometimes other methods need to be employed (stress bonding, ect..) and sometimes you have to take steps back to move forward.
I highly suggest checking out BB’s bonding article:
https://binkybunny.com/BUNNYINFO/tabid/53/CategoryID/9/PID/940/Default.aspx