Well, yeah, that's a problem. But couldn't you show him what you've done so far accompanied by a list of hours you put in? I worked from home for 2 different companies for several years. I'd get the work done, write up an approximate timesheet (I rarely tracked my hours since I'd work for a while, watch some TV, work, answer the phone, work, eat lunch, etc), and that did the trick. Never had any problems with that arrangement.
I worked for a really shitty guy once. Shortly before I quit working for him I started another job. When it came time for me to quit he was reluctant to pay me for my last 2 months of work. When I pressed him, he threatened to sue me for violating a noncompete agreement when he found out I was working for the other company. It never would have held up in court (the companies were not competitors, and even if they were, noncompetes rarely hold up anyway) but at the time I didn't have the money to hire a lawyer to defend against his BS charges so I dropped the issue.
It worked out in the end though; the amount he owed me for those two months work is what I make every week now, and last I heard he's broke and on the run from about 5 outstanding fraud-related lawsuits. Almost makes me believe in karma.
