https://www.polygon.com/2018/9/20/17883444/playstation-now-download-games-ps4-ps2

PlayStation Now subscribers will have the option of downloading PlayStation 4 and remastered PlayStation 2 games in the service’s library, Sony announced today. The capability will be rolled out over the next couple of days.

“Almost all PS4 games in the service” are downloadable, according to the announcement, without specifying which ones or types are not. Downloaded games will also support all user-purchased DLC and microtransactions as well as PS4 Pro enhancements, and online multiplayer does not require a PlayStation Plus subscription — as is the case with games streamed over PlayStation Now.