I bought a 12 dollar cooking scale at fred meyer works good to figure out when your wood has stopped loseing weight, for me here in Oregon its very humid but with most white woods I get them down to about the size you have there then after about a month I reduce it further down closer to size wait a couple weeks then I take it down to floor tiller and let it loose the rest of the moisture it will lose, usually takes about 3 months.
Josh