It is considered an upgrade, so it will cost. Labor amount will depend on the dealership, my upgrades were $35 each plus labor (which I had some other stuff done, so not sure on the total cost, less than $200 total I believe).
2016 requires 3 upgrades
2017 (and 2018?) require 2 upgrades (32261831 and 32261830)
Per Volvo USA site for the Intellisafe Update:
The software package contains four technical functions that have been introduced in different model years, but which can now be offered for all SPA vehicles. The function can only be enabled if the vehicle is equipped with Intellisafe Surround (BLIS), (option code 603).
You must have BLIS.