In the 80s and the 90s, the USDA systematically discriminated against Black farmers (and farmers of other races), leading to some of the largest civil rights settlements in U.S. history [0]. One metric to hit that could suggest that “Jim Crow is over” is for settlements like these to cease to exist or at least become as common a settlements for racial discrimination by white plaintiffs.
African-Americans having the same average income as the rest of population. Would have to deal with poverty, education inequality, incarceration, and employment discrimination to get there. I saw article that says that getting blacks into high-income careers would be enough to fix the average income.
No clue, but nor would I make a claim that I know. By most accounts racial disparity still exists, if not in the US, certainly in other countries. Taking a metric-centric approach as a starting point is probably an issue in and of itself, though.
When all U.S. citizens can vote without artificial obstacles, perhaps. Felons. People for whom IDs are out of reach. People who have to work Election Day. Single parents who can’t easily take hours out of their day to stand in line at the polls.
When there aren't 4+ generation deep African American families who 1st were denied the right to vote by slavery, then by Jim Crow, and now by mass incarceration. Making it so that regardless of what term the United States uses for the management of the black labor population in the end it is functionally identical