GNU/Linux Arch TP-Link Archer T9UH Wifi Driver Setup – Step-by-step Guide
The linked tutorial shows you step-by-step How to Install TP-Link Archer T9UH AC1300 Wireless 802.11ac Driver on Arch GNU/Linux desktop – Step by step Tutorial.
And the Arch Linux TP-Link Archer T9UH Adapter is based on the Realtek rtl8814AU Chipset.
So here below you find instructions to Install rtl8814AU Driver on Arch.

GNU/Linux Arch TP-Link Archer T9UH Wireless Driver Installation Guide