Welcome back! I just restarted SB too after gaining a lot (way more than you lol) with my second son as well
Realistically, with any diet and exercise plan, you can expect 1-2lbs per week.. It's important to realize though that you may lose more quickly in the beginning, and may stall a few times later on, so make sure you leave yourself enough time so that you don't get too frustrated
I know it's easy to feel overwhelmed, but remember, take it one meal at a time, and you'll be there before you know it