Greetings from Afghanistan!
If you are promotable when you reclass, you retain that promotable status and compete for promotion in your new MOS. If your MOS is a Star MOS at the time, your promotion is dependant on the BASD and DOR requirements which is announced on the DA Memo which announces the monthly cutoff scores. When a cutoff score is 39 (to SGT) or 14 (to SSG), it does not necessarily mean that all CLI promotable Soldiers in that MOS will meet the cutoff, they must still meet the BASD and DOR criteria.