This Seeking Tech guide will explain how you can find the hours played stats for PS4 titles without using a PlayStation 5 console.
For this method, you need to use the official PlayStation App. So, make sure to download it and then sign into your PSN account.
You should then be able to find the playtime hours for the last three titles you played from the Play tab.
If the title isn’t on the list, then you need to open and then close it on your PS4. Afterwards, refresh the PlayStation App to find the hours played stat.