There is no method to get registered assets in MetaMask.
Your best bet is to have a token list for which you check balances from a blockchain after the user has connected the account.
You can get address info after get the address please see the endpoint in https://github.com/EverexIO/Ethplorer/wiki/Ethplorer-API#get-address-info
you can get ETH and other tokens info from this endpoint
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