Salaried is only a pay method and means nothing in and of itself. If the employee is non-exempt, then with limited exceptions they have no legal expectation of being paid when they do not work. On the other hand, again with limited exceptions, a non-exempt must be paid overtime if they work over 40 days in the week. In both cases, this is true regardless of how they are generally paid.

In other words, what matters is not whether or not someone is paid on salary or by the hour, but whether they are exempt or non-exempt.