A few months ago, I obtained two bundles of $5 notes, and they were 100% polymer notes.
Today, I obtained one bundle, and it was about 15% paper 85% plastic. The paper notes were almost ubiquitously low grade but with no major damage.
So there are differences over time and at various institutions, but the main point is that there is still no official recall of Journey notes, so it's really just hit or miss if you obtain some. As long as there is no recall, banks will be more willing to recirculate older notes rather than pay added costs of ordering new notes.