If you didn't get the update notification then you can manually check for update by going to Settings > About > Check for update. (maktechblog.com)
This setting is available by going to Settings > Apps > Apps & features. (blogs.windows.com)
Yes, to check if any Android update is available on Lava X3, just go to the settings of the device and we can find an option about phone. (phoneradar.com)