Yes, it's 80% ready for prime time (bugs aside)!!!
How did I get from 40% to 80% so quickly? Because I decided that, for version 1.0, the commands that relate to the mobile web driver are out of scope. 1.1 or 1.2 will have them.
For details, I suggest you check out the spreadsheet I'm using to track progress closely.
Some might call it "cheating". I call it "focusing".