When can I expect to receive the voucher for my LG G Pad

I recently upgraded to Quantum 50/50 and am supposed to receive a voucher for a free LG G Pad.  I'm wondering when and how I can expect to receive such a voucher, and once received how long it generally takes to receive the item?  I was hoping to make it a holiday president for a family member but am wondering whether it will come in time.  My upgrade activation date was November 15.  Thanks!