https://wccftech.com/playstation-now-download-sep/

Last week, a download option surfaced in the pause menu of the PlayStation Now service, hinting at a future implementation of the feature. According to rumors, it’s indeed coming soon.

Speaking with Kotaku UK, an industry source confirmed that downloads are indeed coming to PlayStation Now in late September. The download option will be limited to PlayStation 4 titles in the beginning, and games will be available for play as long as the PlayStation Now subscription is active, like PlayStation Plus titles.