GNU/Linux Arch Netgear WG111v3 Driver Setup – Step-by-step Guide
The linked tutorial shows you step-by-step How to Install Netgear WG111v3 Wireless 802.11ac Driver in Arch GNU/Linux desktop – Step by step Tutorial.
And the Arch Linux Netgear WG111v3 Adapter is based on the Realtek RTL8187B Chipset.
Indeed, for the Linux Wireless Documentation the rtl8187 Kernel Module should support both rtl8187/rtl8187B USB Devices.
So this Dongle may Work Out-of-the-box on Arch Linux!

GNU/Linux Arch Netgear WG111v3 Wireless Driver Installation Guide
The Netgear WG111v3 USB Wireless Device should work Out-of-Box!