The Gray Bypass, north of Macon, is open to traffic in both directions. The part west of what the HB has as US 129 through Gray now has US 129 signage, as well as for GA 11 and GA 22. However, the signage for those routes on the old alignment through Gray has apparently not (yet) been removed, unless they have changed to business route markers with "business" incorporated into the shields in small type hard to see at a distance. I drove the Bypass around Gray, but not the old alignment (could see some of the latter's route signage from the Bypass).
There's another part of the Gray Bypass, east of US 129, that is also open to traffic. My guess is that it is signed as part of GA 22, but didn't look at its signage.
OSM/Mapnik shows the bypass, though not any route designations on it.
Once it becomes clearer what's going on in Gray, including whether the old alignment officially becomes Business US 129/etc., we should update the HB accordingly.