The more advanced countries will be seriously weighing up the options of a third dose.
Economics will be to the fore here.
Cost of a third shot to an entire population which enables an economy to function normally will be money well spent.
I'd expect US, UK and Europe to be lining up third doses now, though not broadcasting the fact too much, whilst being seen to be "generously" donating stock to other parts of the world.
When the buttons get pressed, everyone else will have to wait.
https://nypost.com/2021/07/28/pfizer-says-third-dose-increases-delta-variant-protection/