Yes, I was able to confirm its graduated because in the citi mobile app, the blue card image has changed to a stunning Black one and now its says Citi Diamond Preferred.
I plan on hopefully PC'ing it to some other Citi card, as well as PC'ing the bofa card to something elsa as well.
I'm at 4 cards right now and Experian suggest I have a 5th account just so I'm not considered a thin-file.
The 5th account I had was a secured loan that is paid now so I'm not sure if it really has much real weight when being considered for future apps.
An update on this. I called citis helpline and was able to PC it to Double Cash without issues. I asked for CLI but was told i should wait till I recieve and activate my card thats already processed to be sent out. It's the card I was assigned after graduation from secured. The final card Double Cash will arrive in about 2 weeks.
An item to keep in mind that unless your account qualifies for a (SP) CLI, then it will be processed as a HP, if you are comfortable with that.
Just got my secured deposit check in the mail today, checked my history and it's been 12-months since I applied for the card (I heard it was 18-month as well). Only got the check like you, so I decided to look it up and arrived here haha. I'm hoping to do a PC to the double cash as well (been eyeing it for a while). Hope I'm successful like you, cheers on the new card!