As I understand it, the US is mostly waiting for UL listing of equipment, which hasn't been a priority because no US locals have allowed them. With Utah and others starting to allow them, UL listing will likely come at some point (hopefully shortly) thereafter.
There's this device: https://usa.apsystems.com/ez1-installers/
And also this: https://connectder.com/
If I understand the devices correctly, the current generation of microinverters should meet all power-limit requirements and disconnect if the grid goes away.
State plug in solar legislation tracker: https://www.brightsaver.org/legislation-tracker
(passed in 10 states, 2 awaiting signatures, as of this comment)
Hoymiles just got UL3700 approved this week and sold by Bright Savers