I kept a log on my second batch of Angel fry
https://www.fishforums.net/threads/angelfish-breeding-log-2nd-attempt.472784/. You have about 8 days after the eggs are laid before feeding starts (give or take). I used brine shrimp to feed mine but it is a bit of work to do so because especially at the beginning you need two small batches of freshly hatch naupli to feed the fry each day. Your tank appears to have hiding areas with biofilm on them, ie just below the eggs, where the fry might be able to hide and find food. I had a number of failures before my first success, after that they are easier to raise because you know what to expect. That said I just lost a whole batch because the female just decided to eat them all two days after laying them.