And if you don't hand in progress reports, do them anyway and keep them for audit - you'll need them eventually whether there's any conflict or not.
It's nearly impossible to describe just how ambiguously most people communicate. I've been places where I was in-house and it got to the point where I simply made it a point to be as irritating and lawyerly as possible, not long before I left. It at least communicates "I'm not the one giving up here..."
I should note that people without this personality trait can be successful too. But in their case, the repercussions for slacking off must be real and immediate (usually just being verbally called out). As a business you must have systems in place to know when this is happening.
There is another type of person who cannot be successful at all in this scenario. They will do everything in their power and intellect to get away with slacking off. ...Oftentimes because they cannot stop themselves from slacking off so their options are either: quit, get fired, or try to get away with it. Most people don't quit.
Funnily enough, this is why I've been a lot better at freelancing: I get instant feedback from the client if they're not happy, and I get instant rewards (payment) when I finish a job to a good standard.
Some personality types can handle this amount of autonomy, but most people cannot. Most people need more structure than what existed here. I also think highly creative people are even more likely to slip.
This is a reason why startups are so hard, it's really hard to put together an organization where people can be productive together.
I have three remote workers and I check in daily. When someone inevitably starts slipping, I try to let them know immediately. Otherwise it's my fault when I have to fire them and destroy value that I worked to create. It's throwing money down down the drain in the form of training, familiarity with the organization and acquired skills.