Time Capsule Not In Airport Utility With Wireless Turned Off

I have been trying to find a good solution to replace my old Time Capsule for backups, but there doesn't seem to be a great network based replacement. So I hooked up my Time Capsule to my ASUS router via ethernet cable, connected to the Time Capsule network and put it in Bridge Mode, and turned Wirelss to Off.

I would think that I would be able to see it by joining the ASUS router wireless network, but I can't find the Time Capsule in Airport Utility! How can I connect to it with these new settings? I would normally plug an ethernet cable from laptop to Time Capsule, but of course, Macbooks do not have a physical port

Thanks!