Its not metaphorical at all. I think people use the metaphorical card too much when a verse says something scientifically innaccurate. I only say things are metaphorical when it is blatant (like when Bible says jesus is the door, you don't look for hinges) or it is just how words evolved (like when I say lunatic, not literally mean struck by moon, disaster does not mean a star omen etc)
23:12 talks about the origin of man before they were men, abiogensis
the rest of it says "then"
In gods perspective there is no time. God is outside of time.
23:13 talks about how sperm goes up to a safe place (where the egg is located)
23:14 This sperm and egg mix and grow turning into a clump of flesh (morula). This morula eventually has bones and muscle that form immediately to one another.