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Any negatives on your credit reports? What are your scores like? If they're 660+, I'd probably apply now.
I have friends who, with only 1 credit card on their report, waited for their 6th statement to cut, then applied for Discover it and were approved.

I don't think they send out the Miles invites because when you pre-qual with them they're pushing the IT card as the main option. For those not familiar with the Miles/ NHL/ or whatever else they offer they don't show it as they're older types of options. If you're seeing a small subset of APR then you're on track for an approval. Waiting it out until you're ready though might get you a single APR instead of a range which would pretty much be guaranteed to be approved.