10-09-2020 09:44 AM
In researching this, it appears that the early access on 10/8-10/9 is exclusive to people who pre-ordered Call of Duty: Cold War digitally, which means that only those who pre-ordered through PSN would have access. Best Buy doesn't have any codes to distribute. There appears to be an open beta for all PS4 owners running from 10/10-10/12. More information on how to sign up can be found here. More information on the beta can be found here.
Hope this helps!