With my surgeries, they went ahead and had the lab do quick pathology checks, so they could remove more right away if needed. My first and recent surgeries were on the right side of my tongue, and my other surgery was a neck dissection to remove clumps of lymph nodes (30-some) as preventative. On both my tongue ones they were very careful to go till they got clear margins. I think that is standard, as least to try for. So even if it spreads a bit in the interval, that does not mean they won't try to get it all.

You get more thorough lab reports later, of course, when they have had time to analyze all the pieces.