Aside from maybe GaaS there will always be some time between the PC and PS releases. They simply make more money per sale on PS, so that "premium" new game day one thing will be kept to PS platforms.
I have my doubts, as I mentioned above, the entire PC port effort started with them experimenting with PC ports because they had to port Death Stranding. We went from people finding it unbelievable to where we are now where every single Sony game is expected to show up on PC.
Day one releases could follow a very similar path, if they try it and see that it doesn't negatively affect PS sale but improves PC sales they'll start doing it more and more. Simply not having to do a market push for the game twice is already a huge incentive for day one ports.
All their biggest IPs like Uncharted, God of War and Spider-Man have already had games announced for PC, all the damage (if there was any) has already being done. Day one releases are pretty much only a matter of time. TLoU Part I was already significant, the first time they announced one of this games for PS5/PC at the same time.
I think people don't realize how much harder these last two years were for Sony regarding ports, compared to how it's going to be from now on, Sony is clearly committed to it. They had to go back and port a bunch of games that were not made with PC in mind, most from studios/engines that had never shipped a PC game before. MS for example never bothered with going back an porting Halo 5 to PC yet they were fully committed to PC soon after.
Now every Sony game is being made with them knowing it will release on PC. Maybe the longer windows we were seeing were just the delay from Sony making the decision to port their games to PC and these ports actually being ready (in fact their change regarding PC ports is so recent that there is a good chance we haven't seen a single game release that started development knowing there was going to be a PC version).