Readiness
The NCLEX reports pass or fail, not a score, so this does the same. Three things decide it, and they are kept apart on purpose: how the estimate stands, how much of the blueprint you have actually been asked, and how much of it you will still have on the day.
Not enough evidence yet
You have answered 0 questions. After 40 there is enough to estimate where you stand — 40 to go.
An ability estimate built on a handful of questions has an error wide enough to contain almost any conclusion. Showing it as a percentage would imply a precision that is not there, so we would rather show nothing.
When are you sitting it?
Reviews are scheduled backward from this date and tighten as it approaches. Without it we cannot forecast what you will still remember on the day, and we would rather say so than assume the flattering answer.