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Just checked a 3B and Fico 8 scores are EX 700, TU 704 and EQ 694. Quite a bit better than they were four months ago when I started this process. I only have acces to my EX FICO 2 for mortgage scores, that is 713. Scores are actually irrelevant for the mortgage loan type I will be applying for on the 15th, but anything that makes it easier is worthwhile.
When a preapproval is performed, the bank performs a hard inquiry--but it's free. If you don't have more than a couple of inquiries, the scores would hardly be affected.
You will know your middle score once this is done.