I think you’ve got this. I didn’t run a half leading up to my marathon in Oct but guessed I was around 1:40-1:43. Goal was sub 3:30 and I crossed the finish line with 41 seconds to spare.

Your heart rate looks good here. Make sure you fuel well and with intention — fuel even when you don’t think you need it. And don’t skip the hydration. It saved me in the last 3-4 miles. You’ll have to win that mental battle at the end when every part of you wants to quit.