Add Min and Max to the result CSV

Signed-off-by: Christopher O'Shea <christopher.o.shea@ericsson.com>
The idea with `-t <time>` is to pass a value, still requiring `-r` to actually kick off the run. Adding this would at least require the checks under the "r" case to be added here as well. I prefer to just have folks use `-t <some time> -r`, but open to discussion.