I was just at MK the past week and utilized the app numerous times to book 4th+ SDFP. Pirates was pretty easy to get in the afternoon. I was able to secure a 4pm-5pm FP when booking at around 2:30-3pm on a Thursday. Jungle Cruise was more difficult to get and usually the time slots available were later in the evening. I was able to get a 7pm-8pm Jungle Cruise FP when booking at about 3:30pm on a Tuesday. However, there were none available on Thursday. I also noticed that the FP line for Jungle Cruise is much longer than other FP lines for other attractions.