Where in the Bible do we find this 2,000 year (and still counting) delay?
Also, what was the reason for this alleged delay?
The basis for the delay is right here:
Act 1:6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
Act 1:7 And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
Act 3:12 And when Peter saw it, he answered unto the people, Ye men of Israel
Act 3:19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
Act 3:20 And he shall send Jesus Christ, which before was preached unto you:
Act 3:21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Only GOD knows the duration.