According to a post on the EDForum about the 176/197 routes (and by implication, the 122 as well), "[TFL] expect the routes to return to normal running at 10AM next Saturday (28th)."

I think we've all learned not to hold our breath but as local politicians are all campaigning hard, anyone living in Forest Hill ward might want to ask them what they have been doing to try to expedite these long over-running works. I'm not expecting candidates to be able to make it happen, but I do think that regular attention to contractors, council, TFL and utilities involved is likely to keep this higher up the list of priorities.