Generally, any crop plant that produces a fruit needs to be pollinated. Some require pollen from another plant, while others self pollinate.
That being said, some varieties are parthenocarpic. They produce fruits without pollination. But that's not the general norm.
On my homestead, bananas and pineapples produce fruit without pollination. I also grow parthenocarpic cucumbers so that I can have cucumbers that are grown in a screened shelter that protects them from pickleworm moth. No pollination required.
There are crops that are not fruits, thus no pollination is required to produce them. Examples: Kohlrabi. Rutabagas. Beets. Turnips. Onions. Broccoli.Ccauliflower. Cabbage. Anything leafy. It's a long list.
It's never too late to start! I retired to homestead on the slopes of Mauna Loa, an active volcano. I relate snippets of my endeavor on my blog : www.kaufarmer.blogspot.com