Thanks so much.
This specifies that we would be shown Sabo, Vivi and Hancock after Wano is over though. It doesn't mention them being shown them during an act interlude while the arc is still ongoing as
@Paperchampion23 suggested.
Hell, this makes me update
towards Wano will only have 3 arcs. Sabo, Vivi and Hancock will be shown after Wano is over. If we assume they are the focus of the next interlude, then the next interlude will come after Wano is over.