Yes they know which ballots have not been completed. I went through a failure to form a quorum with a different SPAC 6 months back because they needed, I believe 80% of the 20% being floated to form a quorum. The problem was that many of the shareholders of record were no longer shareholders, so they had no incentive to spend the time filling out the proxy.(The quorum requirement was changed to a simple 51% and the deal was done a couple weeks later.)
I think it'll get done this week on time or we would have seen a large number of PR's reminding people to vote their proxies.
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