I guess quite soon since the first third party vendors to bring such a thing to the market are going to make the most money. I would say one or two months. But you might need to search for it in the internet.
If your underlying question is : do I buy the expensive/not fancy official cover in the meantime?, then it depends on where you'll bring your reader, if you are careful, etc... I can't give any suitable advice in this case.
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