Kristaps Porzingis Blocks Prop is currently Over/Under 1.5 (-130/+100).
The money has been on the Over as it opened 1.5 @ -120 before it was bet up to 1.5 @ -130.
FACTORS THAT FAVOR THE OVER:
The Golden State Warriors have played at the 2nd-fastest tempo in the NBA over the last 10 games while traveling, which ought to lead to increased possessions for the Celtics.