Based on official Harmony docs:

https://docs.harmony.one/home/developers/deploying-on-harmony/using-hardhat

Setup environment

1. Create .env file touch .env
2. Add private key HARMONY_PRIVATE_KEY=12345

Install dependencies

npm i

Compile

npx hardhat compile

Running tests

npx hardhat test

Deployment

npx hardhat run scripts/deploy.js --network mainnet

Verification

npx hardhat verify --network mainnet 0xa5058569A9563374A111577C24E702AfD1438F8E