Ohio State's completed seven practices this fall and five have been open for the media to view.
The Buckeyes' defense had a strong outing, but Day said that the challenge can still build "confidence" for their offense when they win reps.
With the quarterback competition still ongoing, Day said that Will Howard hasn't "won" the starting job yet but has "taken command" of Ohio State's offensive huddle and made significant improvements since the spring.
Jelani Thurman has started taking steps at tight end with two touchdown catches in Thursday's practice, but Day said he needs to develop "consistency" in his third season.