Relax dude. Why would you expect Saturday delivery on a Friday order? It’s only Monday morning, give it a chance.
Unless you ordered special shipping, they normally use USPS, and most guys seem to report 3 to 4 days to receive their package.
If I recall, they don’t normally send out emails, and don’t always answer emails that well. They keep a low profile since their whole business is a bit shady. But I have never heard of anyone dissatisfied with them.
edit - I see you ordered “express”. If that means overnight, I would expect it today. But I wouldn’t think anything wrong unless you still don’t have it tomorrow. You are not certain they had your order in time to ship on Friday. They are a small operation and might not have gotten it early enough or had time to act on it.