The cycle lags. For example:
For corn (to feed cows so we can get milk and meat):
You need to prepare and fertilize cornfields. This happens in the fall/winter. In spring you plant seeds. Then take care of the fields during summer, then harvest.
After harvest you finally are able to feed your cows, then about a year or so later you are able to butcher the cow to eat.
That is approximately 2 year cycle. Of course we have cycles overlapping. All the expenses for that one cycle is already incurred before you see the products on the shelves at the grocery store so the price is still high.
If gas prices goes back down for about 1-1.5 years, we'll start to see lower prices.