Cleaning Validation in a new facility

Hello,
We have a new facility, awaiting PAI. There are some products in pipeline and as we grow, we will keep adding more products. In such case, is it a good idea to pick a worst case to conduct cleaning validation or should we just perform with the products which are in hand and assess the worst case after a definite period of time, say 1 year later? What is the general industrial trend in this respect?

Thanks,
V