Hi, guardmom! Welcome, and congrats on getting approved for the card! I see you were on my message thread before, but no worries. 
They will mail your card 2-3 weeks after the deposit comes out of your bank account. You’d think they would receive your deposit and process it soon after it comes out of the account, but apparently they need to receive AND process your deposit (post it to your secured card account) before they mail the card. That 2-3 weeks is the processing time. After that, they will e-mail you to notify the card has been shipped out. You’ll receive the card within 7 business days after it is shipped.
I got the card about a month ago, and my wait time was about a month (I applied in August). I called them 3 weeks after I sent in my deposit because I was getting impatient, and they said they were experiencing delays. So maybe they are still getting a lot of new applications and need extra time to process.