The PS4 PC/MAC Remote Play client is available to download now. You can get it HERE. You’ll need PS4 software 3.50 in order to make use of the functionality.
You can find the system requirements below.
System software version 3.50 or later
A computer with either of the following operating systems.
Windows® 8.1 (32-bit or 64-bit)
Windows® 10 (32-bit or 64-bit)
Intel Core i5-560M Processor 2.67 GHz or faster
100 MB or more of available storage
2 GB or more of RAM
1024 x 768 or higher display resolution