I just heard on the news yesterday that Pfizer and Moderna offer a long protection, possibly even years, so no 3rd dose needed yet. However they are going to offer people who have received a first dose of AZ a second dose of an mRna vaccin in Germany.

And just read a study has shown J&J to be effective against the delta variant. A study of a grand total of 28 people. Forgive me for not feeling too relieved yet :| Also they confirmed it offers at least 8 months of protection. That's not all that long :/ then again with zero side effects, I wouldn't mind having to get a booster shot.