Time from dilation to labor

I’m 37 weeks, 4 days today. I went to the doc today and discovered I’m 3.5 cm dilated, about 50% effaced but baby is not engaged. If you’re a mom and you received a similar status at some point in a previous pregnancy, how long until you went into labor?

My baby is measuring big so I’m ready for him to arrive! 😫

Thanks.