The UK booster programme begins in September for the over 50s, before the expected winter surge.
The US has fallen behind in vaccinating its population. Something has seemed a bit off from the beginning. Maybe Trump was effective in destroying this particular government department. Or maybe the freedumb culture is undermining things.
Canada has overtaken the US. The EU has finally caught up. It looks like the US is going to do the last 15-20% of its herd immunity the hard way. By people getting covid.