https://www.frbservices.org/financial-services/fednow/about....
While true FedNow instant payments went live a few months ago, there is an adoption curve and a lot of banks and credit unions have to update their back office and risk systems to support instant payments. It will eventually obsolete checks. You can move up to $100k at a time today (and $500k in the future) for about five cents (bank/financial institution charge, most won’t charge you, some might).
If your bank doesn’t support FedNow, call them and tell them you want it.