As of today, Jack is considered to be full term! This means that if he were to arrive now, his lungs should be fully mature and ready to adjust to life outside the womb, even though his due date is still three weeks away.
He now weighs 6 1/3 pounds and measures a bit over 19 inches, head to heel (like a stalk of Swiss chard). Here's a picture courtesy of Baby Center:
Here's the belly pic - I'm huge, there's a 6lb baby in there!