Here's an excerpt from the article:

Thanks to a $500,000 grant from the National Science Foundation, researchers are now looking to accomplish three goals. First, the team will try to successfully deliver DNA containing mRNA vaccines into plant cells, where they can replicate. Next, the study authors want to show that plants can actually produce enough mRNA to replace a traditional injection. Finally, the team will need to determine the right dosage people will need to eat to properly replace vaccinations.