If your tank parameters are of good quality (lighting, phosphates/nitrates, flow, temperature, salinity, pH, calcium, alkalinity. The list goes on....) the new coral should open up within the same day.
If you'd like to feed the torch, you can use brine shrimp or even smaller foods like coral frenzy.
Do not jam the food into its mouth, but rather gently laying it on top & allowing the coral to take it in.
Shutting off the flow to the tank will help with this. (Yes, that means powerhead a & return pump).