id say an ounce a plant is a little too much to expect. i say 18-20g, and its almost all going to be in one nug
autoflowers are interesting and convenient, but i like typical plants myself
my favorite autoflower strain i ever saw growing was easy ryder(and its also the only auto ive smoked to my knowledge) it was a fat healthy little plant fith a fat nug going almost the whole way upand down this little plant. dried and cured the bud weighed 21g but it looked like it could have been an ounce easily