Yes, as long as you’ve linked your PS4 account to your Epic Games account, you can crossplay with PC, Mac, and Mobile players.
Since you are already playing on PS4, you will need to register full account details before accessing the progress on PC and Mac. In order to register full account details login with your PSN credentials following the steps below:
- Access the Official Fortnite Website
- If you are already logged in, hover over your display name and select “Sign Out”
- Hover over the silhouette next to “Download” and select “Playstation”
- Sign in with your PSN credentials
- Register full account details to associated with the Epic Games account linked with the PSN