How to add USDT to Metamask Binance Smart Chain
Important! You are on the BSC network and can only add BEP20 tokens, not ERC20.

Now add USDT BEP20
To add a custom Binance token-Peg BUSD-T (BEP20)
Goto Metamask . Under Assets . scroll below and Click Import Tokens.
TOKEN USDT contract address: 0x55d398326f99059ff775485246999027b3197955
source: nominex.io/blog/guides/how-to-transfer-bep-20/

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This token Below is Tether USDT under Ethereum mainnet
TOKEN Contract Address : 0xdac17f958d2ee523a2206206994597c13d831ec7
source: www.coingecko.com/en/coins/tether