Hello @ScottA,
The Lord Jesus Christ came to fulfill the promises made to the Fathers (Romans 15:8) as you say. Following His resurrection, and during the period of approx. 40 years covered by the book of the Acts of the Apostles, the epistles written during that time confirm the fact that the believers of that day were expecting His imminent return, which depended on the repentance of Israel.
'But those things, which God before had shewed by the mouth of all His prophets, that Christ should suffer, He hath so fulfilled. 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; And He shall send Jesus Christ, which before was preached unto you:' (Act 3:18-20)
* This did not happen, Israel did not repent, they rejected the person and work of the Lord Jesus Christ at His first advent, and the opened door and ministry of Christ Jesus the risen Lord, performed through the Apostles of the circumcision, and Paul, following His resurrection. Then at Acts 28:28, following the quotation of Isaiah 6, in Acts 28:25-27, salvation was sent to the Gentiles, for they would receive it.
* Today is indeed the day of salvation and the church of the One Body, of which Christ is the Head, is being called out, a united, spiritual company who are ONE in Him, they now await His appearing in glory, when they too will appear with Him. ( Col.3:4 & Eph. Phil.)
'For the grace of God that bringeth salvation hath appeared to all men, teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world; looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ;'
(Tit 2:11-13)
In Christ Jesus
Christine