Hard to say but usually if approved it would state so. There may be an issue and you'll have to await their notice. If you don't receive anything in 2 weeks call the customer service number and let them now.
It's important to keep in mind that the only official communication from USCIS that you can rely on are the notices that come in the mail. The online status update is meant to be helpful, but is often not accurate or up to date. With that said, it sounds like you should make a phone call to the USCIS Customer Service and make a Service Request. It may be that the notice was sent out by mail, but that their was an error in the delivery. Also, always make sure you are registered with your post office, that your names are clearly marked on your post box, and that you update any changes of address with USCIS immediately.
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I agree with my colleagues.
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