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IZenithI mentioned, the upcoming update will probably be only the first half of the 20.5 update, with the other half after that, before DC will proceed to 21.
But given the fact that it took DC 4 month, instead of the assumed 2, I would assume the next update will be much of the same. With a bit of hope it might be around Christmas or Jan/Feb, with a seperate Christmas update.
And considering it took DC from Jan to May for Christmas 19.5 to 20.1, I assume Rhoda's update will release somwhere around May 2021.
And I swear if I have to waste half of my playtime on 20.5's first half on shit like delivering pizzas again, I'm gonna flip some fucking tables. The 20 update took 2h more than it should have. Eve's story was longer too, but that shit was at least wholesome af and entertaining and not the same minigame for hours.