Congrats on your new baby!
Tucker is about 7 or 8 pounds at a year and a half. He was 3.2 pounds when I got him at 17 weeks.
Here's a link to a puppy growth chart:
Growth Chart
It says to multiply the weight at 8 weeks by 3. So your little one could be around 9 pounds...but like with people, there's no guarantee.
Here are a couple of Tucker so you can get an idea of how big Ted may get.