Network Watcher makes it easy to monitor your networks usage, it provide a detailed daily usage statistics on sent, recieved and total usage for each Wifi connection on (wlp2s0) interface.
sudo apt install ./NetworkWatcher_1.2_amd64.deb
Network Watcher will start automatically after restart to monitor your network traffic, but if it didn't, you can run the following command in the terminal
NetworkWatcherMonitor
Network Watcher is automatically added to application menu, and can be run from there However, you can also do this by running the following command in the terminal
NetworkWatcher