UCF doesn’t have priority admission…rolling admissions.
I would think that your stats are MUCH higher than 50th percentile if you are applying to Top Ten Knights. Your application process does not begin until EVERYTHING is received. The fee, SAT scores, transcripts, etc all work together to signal the system to look at you.
Applying in January is late. You will most likely be offered admission if stats are high, but you will not hear from admissions office until March. Keep an eye on your account to see if they are missing any critical information (as listed above.) Be sure to accept (pay fee) and sign up for housing the very moment you are accepted. Last year, students not contracted for housing by early March were endlessly waitlisted. Know exactly where you want to live (rank several dorms) and be prepared to do an online payment.