I finished the knitting on the waistcoat yesterday.
Today I started sewing it together. According to Ravelry, I started knitting on 1/16/21 so my goal is to finish by 1/16/22. It shouldn't be too hard to make that date since it's pretty straightforward assembly - shoulder seams, side seams, sleeve seams, set the sleeves, repeat for lining, sew around neck and front edges and hems, and tack lining to knitting in a few places.