To assist what Lukemondo is saying, this is what I got as an answer from Rhys on Jan 7th, when I asked about my order status and if they are really only assigning parts to builds when all of them are available at the same time:
Make what you will out of this, but I too, am not too happy with this system where I see people getting 3080 and 5900X separately in their builds while ordering months later than me.Customer stock levels are best suited to keep the order as it is, you are nearing the front of the production queue which is fantastic news. Once we get to this point both the processor and graphics card should be prioritised to your order.
Your logic is correct as both these components need to be made available for the order to proceed even if you system is at the front of the production line.