A new tweak is available in Cydia Store that allows users to add WiFi, Battery indicator and/or Date Time to Multitasking Bar. This tweak requires iOS 4.2+ installed on your iDevice.
And of course, you should have a jailbroken iDevice to install Multitasking Time 2 on your phone. If you want to jailbreak your device, head over to this post [Windows user here and Mac users here] for complete guide to get untethered jailbreak state on your iPhone.
Note: Verizon iPhone 4 users can also jailbreak their device using Greenpois0n RC5 b4.
You can disable or enable Multitasking Time 2 and configure other options any time in the Settings.app.
- Download Multitasking Time 2 from Cydia Store after refreshing the Changes.