According to several sources, so far it appears no such mandate has been sent to the White House’s Office of Information and Regulatory Affairs yet for approval. The White House, the Occupational Safety and Health Administration (OSHA), and the Department of Labor haven’t released any official guidance for the alleged mandate. There is no executive order. There’s nothing but press statements.
You’re talking about the OSHA mandate, which is different from the EO under the OFCCP applicable to federal contractors.