Seems too early for him to be putting on the bandana. When he puts it on, it kind of signifies the strength of his opponent and signals the end of Zoro's fighting role. But serious Mode Zoro isn't active yet and I don't exactly see anything that would need him to put on the bandana yet.
If we do see him putting on the bandana in the chapter, that pretty much confirms that King (or Queen) is his final fight of this arc and then he will be non-fighting support role.
So I really hope it isn't the case.