We have had a series of questions from people who are stuck outside the USA and are concerned about not being able to make it within the time permitted by their green cards. My suggestion uniformly has been that if the regulatory agencies are not permitting us to travel, we cannot be held to the normal allowed time staying outside the USA. If on the other hand, our own health-related decisions do not permit travel during the coronavirus times, I am fairly certain that we can convince the government to allow extra time. So, my advice would be to not be overly concerned. To reach out to your lawyers. Most of us are working even if we are working remotely.