Sons should be black with white barring, daughters black without white barring. As chicks, the males should have a white spot on top of their head (caused by the barring gene) and the daughters should not.
Overall appearance as chicks should be similar to Black Sexlink chicks, such as the ones in the photos on these hatchery pages. Adults of your cross are more likely to have silver leakage instead of the red/gold leakage that is visible in the hatchery sexlinks:
https://www.mcmurrayhatchery.com/black_star.html
https://www.cacklehatchery.com/product/black-sex-links/