The PCI SSC has issued guidance in response to the Covid-19 pandemic and conducting on-site fieldwork for PCI assessments. Their blog post can be found here.
Given that governments around the world are saying that this pandemic could be ongoing until the summer, I would suspect that the Council will have to issue better guidance than what is in their latest blog post. So I would expect more to come on this topic in the coming weeks.
03/19/2020 UPDATES: The Council has set up a Web page to track any Covid-19 updates. Also, remote assessments guidance has been provided and are allowed given the current pandemic conditions. Key is to discuss a remote assessment with the banks and/or brands involved.