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Welcome to the purple club! Congrats!
I have had my delta card since October 2017. I have requested a cli a couple of times and was denied each time.
Here is a link that may help you https://www.timeanddate.com/date/duration.html. As with most AMEX products, 3x CLI is around 61 or so days. If you did not get it, then you are either on the 91+ or 181+ merry go round. Enjoy your new card.

Im way ahead of you. I applied for Amex blue cash back and was approved $1000 SL this mornining. The 15 Month 0 apr and balance transfer is was what pulled me in. Im seeing Im pre approved for almost every card.
Some changes are expected to the SPG cards due to the AmEx/Chase agreement with Mariott/SPG. So I think it is good to accelerate to get the SPG cards before the changes.