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.3.1
Release started: 2014-06-30
To find your device’s current software version: Settings > About phone > Build number / version
Xperia™ E dual Android version overview
Android 4.0 (Ice Cream Sandwich)
Latest & final version
Android 4.1 (Jelly Bean)
Note: The availability of software updates depends on your country and/or operator.