There's really no guarantee that paying off loans or other debt will be reported right away to the credit bureaus but it can take up to 90 days for the loan being paid off to be reported and show up on your credit rating.
Although it may not immediately boost your score but it will at least be reported as paid off.
It can take up to 6 months to a year for your credit score to improve once your loan has been paid off or any other debt has been paid off.