It's been 2-3 years since I've been on an instant upgrade eligible YBM fare.

If PN space opens up, will I be able to upgrade via the app?

And, visually on the app and the webpage, when no PN space is available, does it look exactly the same as if I was on a lower fare? Showing "CPU Eligible" on the app, "Complimentary Premier Upgrade Requested" on the web? I vaguely recall some text, like 1K Instant Upgrade Eligible, but perhaps that was only when there was inventory available? It's been too long...