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IIRC AMEX credits points on the statement the month after they're earned, so if they were earned in March, they're credited in May; April are credited in June, etc. I MIGHT be mistaken but that's my understanding of it - AMEX is a little on the slow side when it comes to crediting MR points.
I got my 30k signup reward for delta gold within 2 weeks of approval.
Spent over $1k within a week and was credited within a couple of days of the $1k spending.