This was a very wimpy snow storm -- maybe an inch or two, so the only delays at DTW will be due to things like delays caused by deicing or caused by delays at other airports or possibly some of the other things that cause delays (e.g. mechanicals).
DTW area TV stations have been showing shots of the area freeways and they're just wet. The snow plow drivers that do driveways and parking lots aren't going to make much money from this one !
Bob H