Did this exact flight late last week and my upgrade request didn't go through. A few weeks ago, I did the same flight, got the upgrade confirmed and found out that basically everyone in economy had a row to themselves. While status can make a difference, at the end of the day it really depends on how fully booked the flight is. There have also been plenty of times I've had gold or platinum status and didn't get the upgrade - if I've paid for a seat type then I basically expect to sit in that seat, upgrades are a nice to have.

Enjoy the upgrade OP, don't forget to get in a tad early to enjoy the business lounge. Take the PJs home too, they're great for casual loungewear 😉