Randall Fairman had a look today and found this. Looks like maybe next week.

I visited Plymouth Pond around 1 pm today. Near the shore the ice was almost an inch thick, with a dusting of snow on top — 1/4 inch or less. The snow was about as dry as it could be given the ambient temperature of 28 or 30 degrees. Further out, I could see that in places where there’s an upwelling of water (or something), there are places with no snow. These might actually be open water or very thin ice — hard to tell from a distance. There are maybe a dozen such places visible from the road.