Etherscan allows you to search and track the Ethereum blockchain for transactions, addresses, tokens, prices, and other activities taking place on the Ethereum blockchain.
To check your account details on Ethereum main net please enter your public address, the transaction on etherscan.io where you will see all of your account activity, and transaction details.
After you enter your MetaMask public address which is on Ethereum's main net you will see the ETH Balance in native value, today's Fiat value and a separate total balance of all your custom ERC-20 tokens. You will also see all the up-to-date transactions in your wallet.
This balance should reflect in your MetaMask wallet, please note if you don't see your custom token you need to add it manually following this article if you're still having issues finding the tokens or your Ether balance isn't the same in your MetaMask wallet please contact our support.
Note, if you deposit/send your token on a non-Ethereum Mainnet network you can check your balance and transactions on a different explorer. For example, you can preview your Binanance Smart Chain activity on Binance Smart Chain Explorer.