Jayson Tatum is out on Wednesday, but “TBD” for Friday as he continues to recover from COVID. Robert Williams III is back and will make the trip to Philadelphia to play for the Celtics in both games vs the 76ers. Stevens also said Kemba Walker responded well to his minutes against the Knicks and practiced fully today. The games against Philadelphia were never in doubt, Stevens said, and added that testing issues caused the postponement of the 76ers and Thunder game yesterday. Boston plays Philadelphia on Wednesday and Friday.