The Pat offense piled up 13 turnovers in their first seven games, at least one per game, including three v. HOU and 3 @CHI (both were wins).
In the 10 games since, they've had only five total turnovers - three of those against BUF at Gillette in wk-16 (two picks, and a fumble by Burkhead), and one pick each off Brady v. MIN and @PIT. So, the offense has been turnover-free in seven of their last 10 games.
Interestingly the Patriots are a +10 in TO differential, an even +5 at home and +5 away. That's good enough for 5th best in the NFL. The Chiefs are 6th best at +9 but they are an overall +11 at home, -2 away. The Chiefs are good at creating turnovers in Arrowhead so the Patriots will need to really take care of the ball. As you mention here, they have been good at doing just that in the second half of the season.