Ditto to what
dinosims said above. I used to see the points posted when I got home from that flight. In the past few months, I have noticed it takes up to 2 days, which is still not terrible compared to AA's posting period, which I personally find to be the worst in the industry. I commend DL on their faster process.
Also, here's the "official" statement on my TB homepage:
All flights listed above are your future JetBlue flights. Please allow up to 48 hours after travel for the points to reflect in your TrueBlue account