According to the Star Tribune site, 1325 challenged ballots have been counted by the Canvassing Board through Friday. According to the SOS site, there were something like 6500 challenged ballots total to be reviewed, so they still have over 5000 remaining left to count. Of these, as you say, about 400 are withdrawn Franken challenges, almost sure to wind up in Coleman's column. Then there is also the unresolved matter of dealing with the "improperly rejected" absentee ballots, pursuant to the state Supreme Court order.
Please feel free to correct this if warranted or to add additional comments.
Please see my post # 22.