When this goes into effect is yet to be determined. But at least, discussions are ongoing.
From today’s NY Times
April 25, 2021, 5:13 p.m. ET
‘BRUSSELS — American tourists who have been fully vaccinated against Covid-19 will be able to visit the European Union over the summer, the head of the bloc’s executive body said in an interview with The New York Times on Sunday, more than a year after shutting down nonessential travel from most countries to limit the spread of the coronavirus.
The fast pace of vaccination in the United States, and advanced talks between authorities there and the European Union over how to make vaccine certificates acceptable as proof of immunity for visitors, will enable the European Commission, the executive branch of the European Union, to recommend a switch in policy that could see trans-Atlantic leisure travel restored.’