Congrats, what took so long? well looks like they made him a candidate for Concurrent approval, keeps watching ur i-485 status mat, you may get it in next week or so,you never know, i know few golks go got it in same way , just like u , there i-140 took longer then usual and there FP was done before i-140 approved, week after i-140 approval, they got i-485 also, so keep you fingers cross.
good luck