Cade Cunningham currently has 8 more total turnovers than the #2 worst and 27 more than the #3 worst.
The top 5 in order for this seasons playoffs goes
Cade Cunningham: 58 turnovers
James Harden: 50 turnovers
LeBron James: 31 turnovers
Julius Randle: 28 turnovers
Marcus Smart: 27 turnovers
He is possibly on pace to breaking the single season playoffs turnover record set by Jayson Tatum in 2021-22 when he had 100 turnovers across 24 games, he’s currently +1.4 turnovers per game worse than that.
https://www.statmuse.com/nba/ask/which-player-has-the-most-total-turnovers-this-playoffs