Those are good foods, Hikari is a reputable brand. Eventually you may want to get a third or fourth food, variety is better, and Omega One is another good brand and they make sinking foods. Having one that is veggie-based is good, as you have; it helps fish's digestive tract. Corys also like the shrimp pellets, I believe Omega One make one of these. Just make sure they are the sinking foods.
Fish only need to be fed once daily, preferably shortly after the tank light comes on (give them time to "wake up" or adjust, maybe half an hour or a bit longer. Corys also are active during darkness, so they will eat then too. But the food can be added in the morning (= whenever the light comes on). But assuming these corys will eventually be in a tank with other fish, getting them used to the same routine is good.
My fish are used to their feeding schedule, and I always gently tap on the tank frame with the plastic spoon I use to add the food (avoids dumping in too much
). When I sound this "feeding gong," the corys all appear expecting food. This is a good way to be able to see and observe all of them, as they will often spend time under logs, plants, etc.
Depends upon the size of the particular wafer/tablet, but one or two should be sufficient. They will find it; fish have quite a sense of smell and can root out food.