We don't know. Depends on how many chapters they'll be in the Covenant Campaign. They should do it like they did in the past, where each chapter of the story was about 2 renown levels in, so that you get your 2 renown, and then a third renown lvl after completing the Covenant chapter.
So, the first chapter of 9.1's questline will be in Renown 42, and completing that chapter will give us renown 43. And then we'll go to Renown 46, Renown 49, etc etc, until the questline for 9.1's covenant story ends.
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May to June release for 9.1 imo aswell. Could be Mid June tbh. That way, we could see 9.2 in about October or so.
I'm still on the side that thinks we'll lose in the Sanctum of Domination raid, and that we'll have to go to the Gardens of Life for extra aid.
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Therefore, we could get a 3 zoned area like Argus, but with the Planes of Life instead. Then, in 9.3, we could see Oribos as the final raid.
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Hell, the fuckin name "Gardens of Life" just sounds like a perfect patch title.