The fulfilment of Revelation 19 is still in the future.
It is a representation in symbolic language of Jesus Christ’s return to the earth to raise the faithful (his bride) from the dead and judge the earth in righteousness.
Acts 17:31 Because he (God) hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead.
Romans 7:4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
The apostate Christian Church and her false doctrines will be dismantled, and the kingdom of God will be established on the earth.
We learn in Revelation 20 that Christ will rule over the mortal population of the earth for 1000 years.
Isaiah 2 will have its fulfilment.
May I suggest you go here for a brief exposition:
If you have then further questions, please ask
I hope you find this helpful.