There are a variety of pre-made products which do just that. The controller sits inside your electrical service panel (or on a single circuit) and you place a "clamp meter" around the hot wire in question. It then communicates with you via powerline signaling or WiFi (cute little WiFi antenna pokes out of a knockout on your service panel.
Obligatory warning that nothing about being an electronics guy prepares you for the requirements of mains electrical (and in fact mis-trains you). One cannot just hack random electronic components into a mains electrical system, even if the components are UL listed. You may only use approved, preassembled equipment that has been UL* listed as equipment for use with mains power, and you must install it according to its labeling and instructions**. These items are not found at Mouser electronics, Amazon Marketplace, and damn well not Alibaba. They are found at big-box retailers (though they can be sloppy) and your local electrical supply house. You also cannot mix class 1 and low voltage wiring.
* or similar testing lab. CE is not a testing lab.
** because the listing is contingent on installation in that manner.