It depends on how things play out at camp but my guess is Marah herself will need saving from Edward by the time the MC comes back and him taking care of Edward won't leave her with much to argue. But no, there is no way this takes 4-5 more updates. At most two more. I doubt the other camp will get nearly as much time as this one with most of the trials being done. He'll go to the other camp, wrap up the final trial and in becoming the leader reunites the tribes and frees the ambassador at which the MC bounces.
I mean... It could be? But at least for me that would be pretty rushed, especially for the story pace the developer usually follows.
Marah has it in the bag to be the antagonist till the end of the chapter. The mc became the champion of one of the Goddesses that the village (and she) worships and what did she say? "the mc corrupted the Goddess

". So i doubt that even if the mc has to save her from Edward she will accept him. Even if that happens, she will be like: "this is all part of his plan. Now that we captured his accomplice, he did that to deceive us

". My guess is that she will end doing something that put the whole tribe (and maybe the island) in danger (my idea is that she will end up possessed by the thing that appears in the fire), and after the mc saves the day she will finally understand (
or die).
About Edward... Well, the guy is "super smart" and for the events of the v0.5.5 he is now imprisoned as part of his "brilliant" plant to find Kelly, so... No sure how dangerous he can be for anyone right now. I mean, we haven't seen he fighting yet but he looks more like the stealthy type and not someone that can fight upfront against all the warriors of the tribe. If what I say about Marah putting in danger the tribe becomes true, maybe he be part of it or he takes advantage to escape.
The other village and the final trial... Well... Maybe there is a best case scenario where they can communicate with Maia and then they are welcoming to the mc thanks to her, and
maybe that is why the dev put Maia's temple inside the other tribe. If that is not the case, well... I pretty much doubt that it will go so smooth as just go and do the trial.
And about the coronation: we had an update that basically was for the celebration and ceremony previous to Vex' Huntress Trial so... imagine how the ceremony and celebration will be like when the mc becomes the leader XD
But well to resume: my best guess, if the dev go straight to the point in each version and doesn't add a "just chatting (and more than chatting

) the day before I go to the other village" update, is that there will be 4 updates more (including v0.5.6), so the current chapter ends in v 0.5.9