As long as the purchase is rung up on the restaurant's credit card machine (whether because you're there in person or because you call them up on the phone for delivery and they take you creidt card info on that phone call), yes, most any purchase should count usually.

Which is why I warn about the one exception of online take-out ordering, because some of those are handled through third party sites, and might be billed through third parties (if you do the payment online, that is).