Question about being induced- sorry FTM and confused

Tiffany • proud momma to Taylor Mason💙

Since I was diagnosed with gestational hypertension I was told I was being induced at 37 weeks. Nurse even stated, "you'll be lucky to get to 38." So for others who may have had this or had to be induced at a certain number of weeks do they do it the day you turn 37 weeks? Or just sometime before 38?