The long answer -
The EVGA 3080 FTW3 has a TDP of 320W. Keep in mind this is with it's stock configuration. Each 6+2 connector is rated for 150W, however, the maximum Watts per cable is 288W. Additionally, the motherboard PCIe slot can provide up to 75W of power. So, three 6+2 connectors on 2 cables equals a max of 438W plus 75 Watts equals a staggering 513W of potential power.
The short answer - Yes, you will be fine daisy chaining one of your cables.
Bonus question - "If it’s okay can I up the power limit and be fine as well?" Yes, your GPU will likely become unstable before reaching the upper limit of the cables/PSU. However, whenever upping the power limit you definitely need to monitor your rig as these new GPUs do climb in power rapidly. Your cables will get warm before they get hot. Warm is OK, Hot is Not. (LOL)
Please keep in mind, this answer is for the general and enthusiast user. If you are a power user and push your rig 27/7 (i.e. F@H, Mining, long duration heavy rendering computaion) I would only use 80% of those maximum numbers I provided