I haven't seen them yet, but they could be anywhere. My guess is that they were in hiding for the two years after the War of the Best, and they may be settling down for a while, atau they have decided to head to the New World. Otherwise, there isn't much else for them to do, besides raid the Marines and whatnot.
i know that they were in the New World after the war because that is where they put Ace and Whitebeards graves. i would thing that they are waiting for the right time to come back and probably help Luffy. they might have disbanded but i highly doubt it.