Got it handled.
If any one else runs into this just needs this for starters.
paru -Ss xilinx | grep Installed
aur/xilinx-u280-gen3x16-xdma-base 1.3585717-1 [+0 ~0.00] [Installed]
aur/xilinx-u280-gen3x16-xdma-validate 1.3585755-1 [+0 ~0.00] [Installed]
Mod is now present after a modprobe:
lsmod|grep xdma
xdma 28672 0
Now just waiting for Card to arrive. 