The numbers are there. If you're looking for a digested summary from the USDA itself, here is an old 2002 analysis of the 1997 farm census. With industrial farm consolidation continuing since then I can't imagine it's improved. Key point here is the value of sales.

"Of the 1,315,051 farms with livestock, 18 percent (237,821 farms) were farms with confined livestock types (i.e., farms with 4 or more animal units of any combination of fattened cattle, milk cows, swine, chickens and turkeys, or appeared to be raising veal or heifers in confinement). These 237,821 farms accounted for $79 billion in gross livestock sales, which was 80 percent of gross livestock sales for all farms."

https://www.nrcs.usda.gov/wps/portal/nrcs/detail/?cid=nrcs14...

Nice example of a pareto distribution. Eighty percent of our meat comes from the roughly twenty percent of factory farms that confine their livestock in tiny cages.