No.
Also, what do you mean?
Versus the wannabe wizards from the short story? Yes. Also, he would walk over most of the foes from the first half of the books.
Harry's been leveling up for almost twenty years.
In the RPG sense, Harry's the adventuring wizard gaining experience MUCH faster than his homebound brothers and sisters.
Anastasia says once that Harry's seen more than most wizards many times his age.
In the game sense? Yes, if he was a player character, maybe not if he was an NPC (especially a antogonist vs. a an RPG party).
Jim knows what's coming and is leveling and equipping Harry for it.
"OP" doesn't mean "A lot of power", it means "So much power it's not fun anymore".
In that sense, we have to trust that Jim is balancing Harry's powers, allies, gear, and item for the foes and challengers coming.