Does this lead apron comes with a matching tether to connect with the collar? I need to purchase a thyroid collar at the same time. I am looking into the Tethered Thyroid Collar SKU 7020TH.

Yes, if you purchase an apron and a tethered collar on the same order, the apron will also have a tether sewn in. If the apron is purchased separately a tether is not standard and would need to be requested.