There are way more than 800,000 DACA individuals. More like 7-8 million.
There are about 690,000 who are currently signed up with the Department of Homeland Security and have active 2 year work permits.
Active DACA recipients by country of origin, September 4, 2017:
https://www.uscis.gov/sites/default/files/USCIS/Resources/Reports%20and%20Studies/Immigration%20Forms%20Data/All%20Form%20Types/DACA/daca_population_data.pdf