OK, but please don't do what pg did a year or so ago and dismiss anyone who wrote "delve" as AI writing. I've been using "delve" in speech for 15+ years. It's just a question where and how one learns their English.
It really made me uneasy, to think that formal communication might start getting side looks.
Probably 5th grade, but your comment is directionally correct.
I work at a college for fuck's sake.