Despite CDPR having the DLC sent out to Sony to put up on the PSN, CDPR don't actually manually put it up on the PSN Store themselves. They rely on Sony to do this ASAP.
I just took a look myself & the patch 1.04 is now live, but still no DLC. I'd gather whoever at the PSN who's duty it is to prepare this data for download probably has had a big Friday night & is hitting the clubs as we speak, or at the very least is now nursing a bruiser of a hangover depending where on the globe he/she is based. But I'm glad they did take a few moments to prioritise prepping the 1.04 patch, as the game has been damn near broken for us completionists since launch.