The Rev. Al Sharpton has decided not to endorse in the hotly contested 2021 NYC mayoral primary race, but just two days before the June 22 election he’s criticizing frontrunner Maya Wiley’s diversity record. When Wiley left the de Blasio administration in 2016 — where she served as both Hizzoner’s counsel and the city’s Minority/Women Owned Business Enterprise (WMBE) director — less than 5 percent of public spending went to those firms even though they account for 30 percent of Big Apple-based companies. During her two years at City Hall, the portion of total WMBE procurement for the city actually dropped from 5.3 to 4.9 percent, according to the city comptroller’s office. “I’ve not reviewed the contracts but much of our work at NAN is around economic equity and fighting to get MWBE contracts up, not down,” Sharpton told The Post about his National Action Network civil rights group. City Council Majority Leader Laurie Cumbo, who is supporting Brooklyn Borough President Eric Adams for mayor, had harsher words for Wiley’s inability to boost the bucks to minority businesses during her tenure.