Hard to know, I think. There are a remarkable number of people out there who simply have not got the message that the vaccines are safe. Fortunately with mandates coming, that should start to change.
It would be interesting to see some data on it. But there's some substantial segments of disadvantaged populations who have chosen not to get vaccinated - because they don't trust it.
This poll is about 6 weeks old, but it supports what I've been seeing in the news:
Why won’t Americans get vaccinated? | YouGov
The population that says they will definitely not get the vaccine are mostly from the South and Midwest, white, without a college degree. A big overlap with current Republican voters. When they break down by party, 4% of Democrats refuse, but 29% of Republicans and 23% of Independents. Among the "not sure" group the breakdown is 6/13/12 (D/R/I).
I would expect if a follow up poll was done now, the recent vaccinations are probably in the "plan to get vaccinated group" and the "unsure" group from July. Those who do not plan to get vaccinated have their mind made up and don't want to be confused with facts. I'm sure you've known some people like that with other things.
The social pressure not to get vaccinated in some places is so strong that clinics have offered private appointments where people can get vaccinated without anyone else knowing.
The last 5 years have demonstrated there are two separate universes trying to coexist in the United States (and to some extent the rest of the world) now. Earth 1 believes in science and provable facts. There may be some debate on the edges about what is a provable fact or not and what those facts mean, but everyone agrees that up is up and down is down.
Earth 2 believes science information from pillow salesmen over trained scientists and make major decisions based on what boils down to magical thinking. It's a Wonderland world where down is up and up is down. That some politicians are eating or having sex with small children as part of some devil worshiping cult and a billionaire philanthropist wants to track everybody on Earth (for some unexplained reason) by putting technologically impossible chips in vaccines he had no hand in producing.
A fairly significant minority of the US population have had a psychotic break with the consensus reality most of the world has shared for the last few hundred years. According to the above poll, it's probably somewhere around 18%. That's a minority, and it would be a small one over most single issue, but the delusion goes far deeper than any one topic. It's a deep rooted mindset that is not going to go away with rational talk.