Don't expect anything. Keep your expectations at zero.
Not easy to pull off. in my case I've had years of therapy, done lot of courses (still do), read lots of books. I'm not of the opinion, as many on MN jump to, that because our parents gave us a hard time that NC is the automatic recourse. It's not called the nuclear option for nothing and can be disproportionate ie can cause awesome, and longstanding, pain. Two wrongs and all that...
However, if parents are 100% toxic then, yes, NC is the only recourse without question. But, like your parents, my parents aren't 100% toxic. My parents are very damaged, therefore damaging, people. They have no idea how much damage they have caused - they are also incapable of recognising, or accepting, the damage they've caused. In order to accept any of the damage they've caused they'd have to face the damage done to them. They are incapable of that for a variety of reasons, a lot understandable and justified.
It's taken so long to get to this point. I keep control of all contact - for a long time I didn't stay long, sometimes 5 minutes. I don't get upset because that just opens me up to more damage; if I am beginning to feel even vaguely triggered, I leave. I don't tell them why I'm leaving, I lie. I keep everything as level as possible - for my sake.
imo they will want to see you, to see you're alive and 'ok' and to have some general updates. They are incapable of anything more than that. If you're having a hard time don't tell them - it will open you up to more pain and damage. Give them completely sanitised updates - lie if you have to.
In short, don't expect them to be the parents you want and deserve. They clearly aren't that. It takes a long time to accept that - and to accept them.