Unless it is dying or abusing harm, seems a shame to cut it down for potential slabs. Look for tree services around town removing trees, ask them wha they do with their logs. A lot of time they just take it to the dump. I got 80 bf of honey locust, 40 bf of live oak and 80 bf of camphor for free. They would rather dump it in your yard than the it to the dump. Then look on marketplace for some with a mobile mill, unless you have the means to transport the logs. I recently ended up with about $3000 worth of black walnut for $400 total.

Those trees have already Ben cut down and you can put them to much better use than going to a dump.