Hey OP...With the Citi secured card, you can't add to the limit once its set at opening, at least thats what I was told by EO. So, no CLI.
The card has a full term of 18mo, and does NOT graduate any sooner before then. About a month before graduation, they will HP your reports most likely EQ, for graduation, and you'll get a letter about it in the mail.
I ended up closing mine out at 12 mo because the only card I really wanted from them was the Costco cc, and If I just gardened for an extended period of time, Id get it, LOL. I only got the secured card as a better "in" with Citi with a legacy cc. Not as important to me now
Good luck to you! and Ill respond to your PM as well