There's some work in The Lancet on the effectiveness of the PB and AZ vaccines against the alpha and delta variants. To cut a long story short, two doses of the AZ vaccine after 14 days is only 60% effective (in the same way as originally reported) against the delta (Indian) variant.

https://www.thelancet.com/journals/l...358-1/fulltext

Everyone still needs to be careful. Fully vaccinated people are getting it and have died.