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Mine showed up the same day I met the spend requirements.
Mine showed up the day I hit $1000. I got the $50 credit the day after I purchased the $50 gift card from Delta to get that bonus. I've also been receiving statement credits as soon as the eligible purchases post. I've been very happy with American Express.
You need to call Amex. They often screw up these signup bonuses. They blame it on a computer glitch.
Mine came after I made the $1000 requirement also. Maybe 1-2 days. Pretty quick though.
Is the purchase that qualified you for the bonus still a Pending charge?