Sorry, I don't think there's any way to say which class you'll be in at this point. However, the do have a class about once a month, so the wait shouldn't be too long. There are a couple of IWs (IT1toOfficer) that recently graduated OCS that might be able to give you a better idea.
In '04 when I graduated, I went to TAD to Ft. Meade while waiting 3 months to class up, then PCS'd there after NCOBC (Now ELIWOC). There were others that did OHARP while waiting.