Nokia Mobile updated their update tracker site that tracks the release of monthly updates for Nokia phones. The site allows you to see if an update started rolling out for your device based on the SW ID number in the about screen of the phone. Going through the list, it seems that the February security update started rolling out for at least one variant of every Nokia phone, but the Nokia 3.
The tracker was updated yesterday, on 11th March 2019. Nokia 9 PureView is also added to the list, while other devices announced at MWC2019, like the Nokia 1 Plus, 3.2 and 4.2, aren’t on sale yet, and they will be added later to the list. You can check the update tracker here.