I-130 petition for un-married brother how long he has to wait coming to US?

More information is needed.  Is the visa petition approved by USCIS?  What country of citizenship/nationality does he have according your petition for him?  Note that it doesn't matter if he is married unless his lawful permanent resident parent also petitioned him. It seems like you can benefit from a consultation with your current attorney or a second opinion to discuss how this visa petition works and whether he should eventually identify new derivative beneficiaries, if any.