I worked as a scientist in the US. Everything is metric. Cars are assembled with metric bolts.
The only thing left that's imperial is generally the consumer facing untold of pounds and gallons.
There's a lot of domain-specific units in use which aren't even imperial originally (fluid barrel, troy ounce/carat, ton of cooling, horsepower, AWG) that will stick around for a long time since they're used so frequently in finance, planning and B2B transactions, along with other imperial units that'll remain because they've taken on domain-specific uses (acre of land, fabric yard, bushel, mils) even when the engineers and logistics folks touching that same stuff are using SI equivalents.
You're right that consumer marketing is still toward imperial. I think it's just going to be a slow process of gradual weaning away as older people pass on. I'm personally of a "in-the-middle" generation (X) - I tend to be more comfortable with imperial units, but if metric is required, or I think it might be a better measurement to use (depending on the purpose), then I'll use it instead.
Admittedly these are oldish examples, but https://en.m.wikipedia.org/wiki/Mars_Climate_Orbiter springs to mind, and my 2005 Jeep is a crazy hodgepodge of metric and imperial bolts.
The U.S. is on metric; NIST defines and curates standards on the ISU and is a critical, founding participant in the GCWM. Manufacturing and engineering specifications (especially for the military) are usually ISU. It's just that commercially imperial units are still popular. Most people aren't engineers or scientists and so they don't think about this a lot, but marketing loves inertia.