Based on packages through Disney Resort Hotels, your ability to reserve your park days will show prior to your individual tickets showing.
The park reservation is set up through your
hotel reservation (not your ticket number). You can do this at 120 days out (mark it on your calendar, because you will want to be sure you do this for Dec as it is so busy).
You pull up your hotel reservation and it will let you "reserve" for the parks at 120 days out. I reserved in late May for late August park visits (but I do not have actual ticket numbers yet.).
The tickets (magic extra vouchers, etc) do not show up until 4 days prior to your first day there. (I find this soooo inconvenient, but it is how it goes).
There should be a confirmation email you received, with these details. I would look back through that email and check. Or go to the website and pull up your reservation under "mydisneyland". If you bought a package through a 3rd party - you may need to ask them directly. You may need to link your reservation number to your
disneyland account to get it to show up.