When do you suppose my chicks will hatch?

Chicks are supposed to hatch around day 21, some do it before, some after. I usually give them 28 days, then if nothing I dispose of them. I don't normally candle, but I do the same thing you do, I pick them up & tap on them. I don't always hear anything either, then I get a surprise in a day or 2. If you saw the progress, they should be fine, you just have to be patient & let nature take its course. You said that you turned the incubator on around 11PM, do you not leave it on all the time? I keep mine at 100 degrees & constantly have it turned on. The thermostat tells the heater when to come on. When you open the incubator you let out humidity. It doesn't hurt to mist the eggs when you open the incubator when they're close to hatching. Good luck & have fun! :)