According to this that I'm looking at: https://www.origin.com/usa/en-us/store/origin-access/premier
You already have the premium battle pass for this season. As you level up the battle pass, you should be given the premium rewards in addition to the normal unpaid BP rewards. The easiest way to check to make sure you are given the right rewards is to check to see if you have the Legendary Hemlok skin that's given at level 1 for all premium battle pass owners.
https://apexlegends.gamepedia.com/Hemlok_Burst_AR#/media/File:Retrofitted_Hemlok.png
Click on that to see a pic of the skin.
To find said skin, once you download Apex there will be tabs at the top. "Legend" "Loadout" "Profile" tabs, etc. etc. Click on the "Loadout" tab, then the Assault Rifles category. Then find the Hemlok Assault Rifle. Click it, and from there you'll have a list of all the skins you currently own. Names that are greyed out are not unlocked yet. The Retrofitted Hemlok skin has gold text and should not be greyed out.
