COVID 19: How to face it in the workplace? The French exemple

In this context of crisis, most French employers have already mobilized to inform their employees about the precautionary measures to adopt both in terms of behaviour and hygiene, in order to avoid risks of contagion in the workplace. Some have also already implemented a series of measures aimed at work organisation by favouring teleworking or videoconferencing or even by restricting certain journeys. Should the employer already anticipate phase 3 and how?