Only a select few devices will be getting Android nougat update. M3s won't be getting nougat update.
You can post a request for Android base update for m3s in the suggestions sub section.

Maybe in next year or July... It might get 6, but it is not confirmed to get 7.

I read in a comment that m3s will have no android update this year and maybe it is never planned

not now we have to wait