Everything he's willing to share he publishes is the dev logs

So I can only make conclusions based on this.
There was a period when he made 1750 renders in two months which gives ~30 renders per day (but that's only SG without WiAB)
There were his benchmarks of the new workstation with the result:
"From now on, I aim for 70 renders a day, but I won't beat myself up if it's "only" 40-50."
Ofc, I think he overestimates as always, there are other tasks that take time, but to complete 3000 static renders in three months by the mid to end of the August he need to make "only" ~35 renders per day.
I know at least several devs who work with similar or even faster speed and produce ~300 renders per week. Yeah, their pictures aren't as advanced as Ocean's and doesn't contain dozens of characters in a single render. But they look pretty decent, pretty close in quality, 8K resolution and high quality character models.
EDIT: I mean they do it without any harm to the other aspects of the game, like writing the script, coding and other...
So it's doable, but with WiAB releasing at the same time and other ongoing activities like creating cinematics or testing and learning new software and animation tricks - I don't know.