According to Ethereum creator Vitalik Buterin, gas fees could be as low as $0.002 after the ETH merger. To be clear, the combined gas fee drop, including aggregates, could be between $0.002 and $0.05.
Earlier news, the Ethereum Goerli testnet has completed the merger, Goerli is the last of the three public testnets of the Ethereum testnet, after this, the mainnet merger is expected to happen sometime at the end of September.