While black unemployment is at a historic lows (yay, good thing!), black wages are not keeping up with wage increases in the rest of the country (booo, bad thing!).
Depending on the data set you use, African-American hourly wages in the US grew between 2.4% and 3.5% over 2017 and 2018. That's compared to median US hourly wage growth of somewhere between 4.8% to 6.3% over the same two year period.
What worrying is a couple of things:
African-American wage growth has been below the rate of inflation for the last two years (averaging around 1.8% to 2.1% per annum). So, the majority of working African-Americans have seen their relative incomes decrease in the past few years when accounting for inflation.
The vast majority of African-American wage growth has occurred for individuals with a college degree or better (representing less that 12% of the workforce). Individuals without a high school diploma saw their average wages fall over 2017 and 2018 and individuals with a high school diploma have basically been in a wage freeze for the last few years.
African-American average working hours have dropped, but only very mildly, over the last two years. On average, working hours have dropped from about 34.5 to 34.3 hours per week for full time employees. That's a drop of about ~10 hours per year, or a loss of about ~$235 per year at median wages.