Is it correct to have a comma before "and" / "or" in the following context:


"This includes demonstrating and communicating appropriate standards of workplace conduct, monitoring such conduct, and promptly reporting any alleged incidents or concerns to the next level of management, and/or our HR/Office Manager."

"Prohibited harassing conduct may include inappropriate jokes or innuendos; epithets, slurs, or negative stereotyping; displays in the workplace of offensive materials; and any other physical or verbal conduct or visual material."

Is it correct to have a comma before "and" / "or" in the above sentences?