If it's like ARR and Heavensward (and it probably is) there's two codes. One for early access, one for the main game. All we have so far is the early access code which is why that is all that shows up. We'll later get the actual game code (either digitally/via email or with the physical product). When you enter that code then it'll activate you for the actual game (standard or collectors). As with both ARR and HW the early access code is likely to work for at least a week to give you time to receive your codes for the full game.

But again if it's like ARR/HW then you won't get the collector's items until the main game launch (20th June), even if you have early access.