Fed No.
The US is not the world and the rest of the world is certainly not on FedNow, and never will be.
At least with stablecoins like USDC on Ethereum, Stellar, Solana, etc it is available today 'right now', worldwide, 24/7 and with instant, same day transfers with low fees.
I wonder why USDC is currently being used on these blockchains today from all over the world, 24/7 in the billions of dollars daily and has been integrated into business like MoneyGram, Stripe, VISA and Coinbase Commerce and even the United Nations using it for donations and humaritarian aid, who are not 'Nobody'.
"Nobody" is using FedNow 'right now', and there is a obvious reason why nobody outside of the US cannot use and will never use FedNow.