You'll probably get a small patch update first before the big one.
Remember also, it's nearly a 700mb file so best done over WiFi and make sure you have at least 60% battery before you start.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)