It was purchased at 2.46 pm est time and I just checked my in-game email today, 4.25.2016, at 9:43am and it's still not there.
If it's been over 24 hours then what I would do is call customer service to ensure there was no issue in granting the items to your account. That would be the best way to get the items sent to you. You can use the below information to call them:
For details on how to contact SWTOR support you can follow the steps outlined in this article here : How to get help with STAR WARS™: The Old Republic™
[CM - Edited post with updated article on how to contact support for STAR WARS™: The Old Republic™]
