while the PS5 is not confirmed for release.. you can say you still have at least a year of full PS4 support. This is because once the date of PS5 is released it's not like it's coming out in two weeks, it's like 8 months or so before it's out in the stores. After that you can see PS4 games slowly being leaned out of the selection, which will take about 2 - 4 years.
All games for ps4 are designed to play on PS4, so there is actually no worry about them being playable, but the PS4 Pro does offer faster hardware and can produce better gaming experience by having an edge with higher performance (less lags and better graphics)
also this is a PC building section