In the simplest of terms, the answer I would give is that an employer should make sure that they are in compliance with an OSHA Inspection. It is not in the best interests of anyone if an inspector finds a business setting in violation of safety issues. Citations, fines, and even shutting down the business can be the result of a lack of compliance. It is in the interest of the employer, the employees, and the inspector for a business to be in compliance with safety regulations.
An employer must make sure that compliance is not something that is simply addressed in the inspection as those inauthentic attempts are usually caught at some point. The employer must make sure a safe working environment is a critical part of their operation and the employees' reality. This might involve hiring an overseer whose primary purpose is to ensure workplace safety and compliance with OSHA regulations.
I think that an employer should be able to be open and honest with his employees that an inspection is forthcoming. If they are able to announce this, there is a good chance that they are in compliance and that they welcome the inspection as an opportunity to showcase how workplace safety is something valued by the organization. It is here where I would suggest that an employer embrace the occupational safety guidelines that OSHA outlines and adhere to it with all possible dispatch.