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Congrats on your approval. No one can answer the question about getting 3xCLI other than just guesses. Use it alot prior to then and if your use/profile/income supports it then you will most likely get it. Athough the only person that really knows this answer is Amex.
91. YMMV. Amex took a year and a half for a significant increase. $1000 is a borderline approval. Like mine was. Started at 1k 12/15. As of now 5k.
Congrats on the approval.....you never know....it will depend on your file. I know quite a few people who couldn't get a CLI for 6 months, and then it was minimal.
If your wife has not had any cli with Amex in the past 180 days, then her Delta account will be eligible for 3x