Is it too late to add dry rock to my saltwater tank?

I ordered dry rock online and it's suppose to be coming in 2 days, I'm wondering if it's too late to add dry rock into my tank? Right now my tank only has sand and some live rock, so i'm wondering if it's too late to add dry rock to my tank so the live rock can seed it. Should I have waited for the dry rock first to get live rock?