Though not all colonists supported violent rebellion, historians estimate that approximately 45 percent of the white population supported the Patriots’ cause or identified as Patriots; 15–20 percent favored the British Crown; and the remainder of the population chose not to take a vocal position in the conflict.
For certain.
I am digging around and finding some data points:
link: https://courses.lumenlearning.com/boundless-ushistory/chapter/patriots-and-loyalists/
Anyway, 45 percent or so is neither a "great majority" of the population or a tiny fraction.