Per Adrian Wojnarowski, "the NBA is allowing teams to open their practice facilities to players in cities and states where local governments have eased stay-at-home orders." (Adrian Wojnarowski on Twitter)
This will only apply to a handful of teams, as many states have yet to begin the process of easing stay-at-home orders due to Covid-19. It is worth noting that facilities will be open to players strictly on a voluntary basis for individual work and that large group workouts are still prohibited. Regardless, it is a positive sign that players located in such cities will have access to stay fresh and work on their game while awaiting word from the NBA on the status of the 2020 season. As for players and teams in NBA cities that have yet to loosen restrictions, the NBA is planning to work on other arrangements for such teams, per Adrian Wojnarowski.