I've only recently started nonlocal multiplayer like you'd do on the XBox and if it works the same as on Switch, one person Hosts so they alone have access to the "master" farm and I'm pretty sure they can play on it when the other people are not available. But everyone else can only play when the Host is playing that Farm on SDV so there's a bit of coordination needed to set a time for 2 or 3 or 4 to play together.