After your I-140 has been approved, you may extend your H-1b as many years as it takes for your I-485 to be adjudicated. COS to TN itself won't help you to extend H-1B beyond 6-yr, given your 6-yr H-1B is ending in about one year.
After your I-140 has been approved, you may extend your H-1b as many years as it takes for your I-485 to be adjudicated. COS to TN itself won't help you to extend H-1B beyond 6-yr, given your 6-yr H-1B is ending in about one year.