kingdom come

(figuratively) Death; also, a state of complete annihilation.

(Christianity, specifically) Heaven or paradise.

(uncountable, Christianity) The rule of God over the world in the future; especially, according to those believing in millenarianism, during a period of peace beginning with the second coming of Jesus Christ and lasting a millennium.

(countable, by extension) A future period of happiness, peace, prosperity, and/or great progress; a golden age that is approaching.