Pwn20wnd announced the release on Twitter:
unc0ver v3.0.0~b1 is now out with iOS 11.0 - 11.4.1 support for A9/A9X/A10/A10X/A11 devices with voucher_swap by @_bazad!
I have been late with this one due to the lack of testing devices. A7/A7X/A8/A8X support will also be added as soon as possible!
unc0ver v3.0.0~b1 is based on v2.2.0, thus it contains the latest changes and takes the full advantage of Cydia Substrate!
The jailbreak has already been updated to v3.0.0b4 fixing a bug in installing Cydia.
You can download the unc0ver jailbreak from the link below...