The ideal temperature for this recipe is 100°F / 38°C. Using a thermometer, or better yet a digital temperature gun, take the temps of both the lye water and the pan of oils. They should be within 10 degrees of one another and around the temperature mentioned.
Before moving to the next step, you need to melt the reserved shea butter. You can carefully use the microwave or melt it on very low heat until liquid.
If you're oven processing your soap, you should turn your oven on now to a low setting. You want the interior to only be 110°F/43°C when you put the soap in. Keep an eye on it so that it doesn't get too hot.