Also, I will be annoyed if Niantic doesn't do the obvious thing and release shiny Zamazenta right after Zacian so that I can finally pick up the shiny.
I would imagine Zamazenta will follow Zacian immediately but it's possible they space them out a bit to draw out the season's theme. Galar doesn't have a lot of legendaries to put in t5 raids after all.
Might be the end of October but that's usually reserved for your Halloween staples like Darkrai and Giratina. Given Sinnoh tour was this year though, maybe not - could it be possible we get Spectrier released next month? Given they released Cosmog long before Necrozma I don't see why not, Calyrex could absolutely be saved until a future Galar tour. I don't see Eternatus debuting for a long time (and they'd make sense to do together). Kubfu seems like the sort of mon they should save for a season-long research, but wait for them to just make it a ticketed encounter like they did with Keldeo.