Infotainment and map updates are done at home by replacing the SD card in the dash. But, the OE charges for the update. Kia will give one free upgrade to each Kia owner via the concierge support line, but not all the operators know about the program.
https://www.kia-gpsmap.us/map-updates/stinger-map-update.html
Firmware on other computers are dealer only. Owners are seldom notified unless it's really important. Just keep an eye out for TSBs or other notes.
OTA updates are evolving. Tesla does it. There's tons of issues with that (reliability #1), so the OEMs are moving slowly. I bet it'll be more common in another 10 years.