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You can find the current system requirements listed at http://blogs.adobe.com/digitalpublishing/supported-devices.
You may also want to reference Digital Editions Supported Devices - http://blogs.adobe.com/digitalpublishing/supported-devices for a list of supported devices and applications.
Always worth searching before posting in case the question is already answered.
when will adobe digital edition available in Windows 8 RT?
Probaly never. It isn't available on any other tablet OSs.
You need to install 3rd party apps such as Bluefire, Aldiko, Overdrive or similar to read eBooks. (sometimes they have something pre-installed).
Unfortuately some of these apps are not yet available for Microsoft Surface;
I guess they will be made available when/if Windows RT becomes a mainstream tablet OS.