Even more pedantic, but in economic theory in a perfectly competitive market (edit: at equilibrium) economic profit exactly equals zero. This is because the owner not doing something else with their time (called opportunity cost) is accounted for as a cost. What you're describing would be called "accounting profit" instead of "economic profit" by an economist to specify it only takes into account costs on the books, not opportunity costs.

Edit: See https://en.wikipedia.org/wiki/Zero-profit_condition