You may already have the latest software, depending on the date of purchase. Software updates are released at different times depending on operator and/or country. Therefore, we cannot give you an exact date for when a specific update will be available for your device.
Android version: Google Android 4.1 (Jelly Bean)
Latest available software: 11.3.A.2.33
Release started: 2014-06-30
To find your device’s current software version: Settings > About phone > Build number / version