We went to the courthouse early also. With any luck, you'll get the plate right away and the title in the mail in a couple of weeks. I understand ETI is now sending the price paid as shown in U.S. Dollars and maybe Canadian Dollars. On ours, it showed only Canadian and I took an internet printout from Royal Bank of Canada showing the conversion to USD. That took a lot of back room discussion, but they eventually accepted my number.
Definitely get the insurance lined up. You can have it started immediately, if you are the worrying type, or for the expected pick up date.