I think that Elon thinks that first batch of FSD could be uploaded by Easter Holiday. Note the question mark in the tweet, so it is not a commitment, but a possibility in his opinion.
I think that this means that there is a good chance that by the time Model 3 ships in volume, the first iteration of FSD software will be complete.
At that time it would be interesting to see a video of Tesla vehicle navigating a route in FSD mode in Pittsburgh, side-by-side with a roof-top Taj Mahal adorned Uber vehicle doing the same.
I personally like the "ghost-busters" station wagon analogy for the Uber-mobiles.