This is like asking when the socialist revolution will happen in the Qing dynasty. And as history showed us, the answer was never because the Qing dynasty had to fall before the old Confucian-Daoist-Legalist-Buddhist ideological superstructure that had served China so well for over a millennia was broken, creating an ideological void that was filled by the May Fourth Movement, which was the seed that eventually became the CPC.

If you're asking about a socialist revolution within the landmass currently occupied by the settler colonial entity known as the United States, I mean it's socialism or barbarism. Barbarism will be either of the ecofascist variety, the nuclear wasteland variety, or the climate catastrophe variety. Assuming the US doesn't get glassed by Russia or China in a future world war, most likely, the US will be balkanized into various successor states with a possible rump state that is still internationally recognized as the US. Successor states that have strong relations with anti-imperialist countries or arise from national liberation struggles led by the Indigenous and other internally colonized peoples will have a softish landing and be less fucked by climate change while successor states without those will spend their last days in completely depraved white supremacist Christofascism before getting wiped out by climate change.