You'll want roughly two fermenting barrels per press. The devices aren't super transparent with their mechanisms, but going on memory it was maybe a minute per bucket of oil from each press, 30 seconds per bucket in each barrel. The oil generator takes maybe a minute and a half per bucket to burn at 350RF/t for empowered oil. Also note that you'll need to convert some of the canola back into canola seeds: The drop ratio of canola to seeds doesn't quite give you the six seeds you need per bucket of fuel. It can get super fiddly to make handling this fully automated. I dropped off on that point: I just made sure I had a good surplus, and then occasionally shift stuff around when a stock of anything looks low in my Refined Storage system.
I set up a 9x9 Canola field (as that's the max size AA's farmer supports), with 9 earthworms and full coverage of AA greenhouse glass over the field, for max growth boost. Despite all of those speed boosts the AA farmer is still pretty slow, since it passed over the field 1 block per tick to plant seeds, and then 1 block per tick to check for harvests (and maybe a third passthrough to till? I'm not sure if it skips that once the field is set up). With 3 pressed and 6 barrels, the system was operated in pulses with plenty of idle time. They fed into six generators without any backup of oil to jam the system up.
Hell of a lot more work for 2100 rf/t than just making a 3x3 Extreme Reactor, but it's a much more engaging engineering task, at least.
