Congratulations!
I came out to my parents a few weeks ago. They're very supportive but they call me their son still, preferring to use he/him/his when referring to me. I'd been biting my lip but this weekend my mother asked me what I wanted to be called. I think they're trying as hard as they can

Like Kendra said I feel like it'll take at least until they start seeing visual cues to be able to call me their daughter, and I'm OK with that. I'd been their "son" for 28 years, it's bound to cause some emotional dissonance for them.
I think time will help