The NCAA site says the information is not public at any time except for coaches -- not sure how the information becomes public without the registered coaches saying it. Here is what the NCAA saysIf its like football then the information is public once they are entered by the school. There's a few sites who publish the information in real time. I guess Extra Innings is the softball site whereas On3 and 247 do football.
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Can I view the NCAA transfer portal?
Can the public view the NCAA transfer portal? 3) Coaches can see who is in the portal, but it is not public information. 4) Athletes can withdraw from the portal; it's then up to the school to decide whether to take that athlete back and restore his/her scholarship."
Not sure how it gets out without some privacy violation occurring.