The Nets’ facility in Brooklyn and the Knicks’ campus in Tarrytown are supposed to be shut down under the state’s order. A person familiar with the NBA situation said plans are still fluid, but players on teams located in COVID-19 hot spots such as the Nets and Knicks would be helped out if Friday becomes the day for opening league facilities. At the facilities that do open around the league, players can participate only in individual workouts — and not group sessions — the person said.