Short answer? Time.
Just like with forming relationships with people, trust develops over time. You're earning their trust. It sounds like you're doing awesomely so far.
What are you doing for daytime bonding? Bonding pouch (or in your shirt, or whatever)? If so, then that's great.
Doing play time at night? If so, woo!
You already said you're giving them treats, that's always a good way to suck up. :D
It sounds like they at least like you at this point! Just remember to keep going at their pace, and continue to spend time with them and love on them just like you're doing, and in time they'll love you too!