Forgot to add spices to curry
You will need to cook the spices before adding them, but you can add them in now and it will be fine. You can either dry-roast the spices in the pan or cook them in a little oil like making a tadka. 

Probably if the cumin is whole, dry roast it until it starts to turn golden then add the turmeric and paprika and cook it for just a few seconds more. If everything is powder, I'd heat a bit of oil and add all the spices at once and cook for a few seconds.

If there is coriander, too, though, I feel that needs a bit more cooking.

The flavors will blend overnight in the fridge, and further when you heat it before serving, so as long as the spices are cooked, it is fine to just mix them in.