The Farm Bill is the primary agriculture policy document in the nation. It’s passed roughly every five years. The last one was signed into law by Trump in December of 2018, so the next one is due in 2023. Lots of info here: What Is the Farm Bill?
The first hearings in the House for our current law were held nearly a year before the bill was passed. I don’t know how long before that the prep work began, but I don’t think right now is too soon to try to get up to speed.
Food Policy for Climate Activists 