https://www.gamespot.com/articles/ps4-last-day-for-playstation-plus-games-of-septemb/1100-6462172/

This is the final warning for PlayStation Plus members who haven't picked up their free PS4, PS3, and PS Vita games for September. Starting October 2, September's freebies go away and will be replaced by the free PS Plus games for October. So hop over to the PlayStation Store to get your free games while you still can.

The biggest freebie is Destiny 2, the massive shared-world shooter that puts the loot grind front and center once you beat the campaign. Thankfully, you'll find plenty of things to do on your quest for new guns and armor. This is just the core game, so it doesn't include Forsaken, the big year-two expansion, but it offers more than enough content to help you decide if you want to buy in.