Victor Wembanyama is currently leading all rookies in steals per game and leading the NBA in blocks per game.

In 18 games played, Wembanyama leads the league in stocks per game at 4.06 per game ahead of Anthony Davis (3.79) and Brook Lopez (3.53)

He leads all rookies with 1.3 steals per game. He is tied for most blocks per game with Anthony Davis and Brook Lopez who each have 2.7 blocks per game.

So far he is having one of the greatest defensive seasons for a rookie in recent memory.

Source: https://www.teamrankings.com/nba/player-stat/steals-plus-blocks?rate=season-totals