There will be a noticeable lessening in the intensity in German resistance in the west starting around the end of January. The were stoked for this offensive, and when it failed, there was nothing left. No soldiers, no weapons, no supplies, no morale.
From the stories I have read and a couple I have heard first hand, once the Russian offensive began a lot of Germans started thinking surrendering to the Americans or Brits sounds a lot better than being taken by the Russians.