Hello,
You can use darkstat for this purpose. Install it with:
opkg -e /etc/opkg/openwrt/distfeeds.conf update
opkg -e /etc/opkg/openwrt/distfeeds.conf install darkstat
Edit /etc/config/darkstat to suit your needs. The details you are looking for are in the hosts tab of the interface of http://192.168.1.1:667 by default.
Beware, there is an issue in the start script look at this link to fix it.
Regards,