Adjustind status DUI(expunged) Criminal Records, Expungement

My wife is a RN and legally has a job at the hospital, Graduated university in USA, no criminal record.

Me: have Bachelors of Biology form the USA university. Legally employed by the university.
We both are on F-1 visa right now going through OPT.

We want to apply for adjustment of status, cause RNs are in schedule A. I will be applying as a spouse of RN. in Oct 2008 I was arrested for DUI and possession of weed. I pleaded guilty in abeyance and I am going through diversion program which ends this march(2010). After the successful completion of it, my charges will be expunged or dismissed(not sure which one is it, or if there is a difference). No prior convictions or violations of any kind.

Should be worried? should I wait till charges are dismissed?


Thank you!