Can i get balance address in dApp using MetaMask without private key using Flutter

i'm following this tutorial https://dev.to/bhaskardutta/building-with-flutter-and-metamask-8h5 In this tutorial, article use walletconnect_dart dependency to connect app with MetaMask. Now i want to get the current balance available in MetaMask. Can i get the balance just using address account? Do anyone can show me some tutorial to get the balance to app in Metamask?