After you've initially baked the base in the oven, you can then put the base in the fridge for later, or even freeze it.
In case you're wondering, I topped my pizza with passata, italian herbs, sliced tomato, sliced kalamata olives, then then when it came out of the oven, rocket (with a teeny drizzle of oil) and cashew cream.
If you're not sure what cashew cream is, you're not living. It is the best! Basically you soak cashews in water for a number of hours, then blend them up with a bit of water. Add some salt and pepper, plus a bit of vinegar and you have a basic cashew cream. More water and vinegar = more like salad dressing or sour cream, less water and vinegar = more like a soft cheese.