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Your confusion is absolutely immense GAI am not assuming the Kingdom came immediately. It took at least 33 years if you count Jesus' life. Longer if you include the time until the daily sacrifice was taken away by the Roman army.
It is you who assume His point of departure to be this earth; it was heaven, not earth. He went and came back already. He came into this world (far country), died and rose again defeating Satan and death. He then returned to His original place, heaven, and is waiting until the Father decides enough is enough.
And He tells us that His Kingdom does not come by observation. So why are you looking for it?
Yes. He sits on that throne now. It is called the heavenly Jerusalem. The physical Jerusalem is not a fit place for the Lord of Lords and the King of Kings.
If you partake of the Lord's Supper you are eating and drinking at His table in His Kingdom.
You "spiritualize" and twist the scripture to your own detriment.