They would probably already announce it if the end would be around 200 chapter. They seem to stall the manga for now(and i don't rly like it), i wish it would already end or at least this arc, i didn't expect this manga to became some serious fightning with aliens manga when i started reading it, i want them to come back to the goofy naked knee sock thing while they are traveling.
Also some romance fulfillment would be nice in the end.