UK cases, which were lower per capita than in the US, have tripled in the past month while US cases declined. 60% of the new UK cases are the delta variant (one of the ones from India), which is maybe 3x as contagious as the original variant. It has estimated Ro of 6 in non-lockdown (open) conditions. Single doses of vaccine are less effective than they were previously in preventing symptomatic cases (33%) Two doses still give good results, although not quite as good as previously (88%). The loss of taste and smell doesn't seem to be a common feature of the delta variant.
6% of the new US cases are now the delta variant, but it will almost certainly become a higher percentage.