Can I use VisionOS SDK in Intel iMac 2017? Please somebody answer this!

Absolutely, Xcode 15 beta with visionOS SDK can run on your Intel-based iMac (2017) as long as you have macOS 13.4 or later installed.

See also macOS Monterey is compatible with these computers.

Please feel free to reach out if you need further assistance.

From what others have said (and my own experience) 16GB of ram on an Intel Mac is the absolute minimum required to even open both XCode and the Vision Pro simulator. 12GB total gets taken up by running even the Hello World example from WWDC23 on Intel when XCode is open to compile it. I haven't heard that anyone has gotten a compiled visionPro app to "drag and drop" work with the simulator, so you need to run it with XCode open, and that's 12GB for XCode + Simulator as I said.

People are saying that even a 16GB M* system works fine, at least with the sample apps, so that's your minimum system for serious development I think, though you might be able to learn visionOS programming with Intel Macs if you enough RAM or at least a system that isn't prone to overheating like my 2018 Intel Mini.