I get a similarly worded message on my '18 Terrain. Yet I know for a fact that there is at least one newer version available. It could just be indicating that there are no OTA updates available, not what the dealer could install. BTW, mine is "similarly worded" since, at least in 2018, the 'Nox and Terrains had different infotainment systems.
The following may be different for the 'Nox: To see what software version you are at you need to follow System -> About. To see the info similar to your image I had follow System -> Updates.
2018 Terrain Denali, 2.0T, Blue Steel Metalic/Black
2013 ATS Premium, 3.6 V6, White Diamond Tri-coat/Brownstone
1967 Camaro, 327, Butternut Yellow/Black