Yes, it sounds reasonable to me. However as the pan is off, why not change the filter, add 8 NEW quarts any way you want to (all in the pan, or prefill the filter and put the rest in the pan), start it up, shut it off, wait overnight, and then mark the dipstick?
I will mention that will my minimal experience in such matters (I've only called two manufacturers on this issue), I have never seen an aftermarket pan
oil capacity rated for the system. It's pan only as the pan manufacturer have no idea if you are using a long or short filter, a remote filter, an
oil cooler, etc.