Moonikin Campos(Commander, full mannequin), with two mannequin torsos called Helga and Zohar for the three crew.
two hour window starts at 80% chance of launch with a closing window at 60% chance of launch - at time of writing. Link shows what's what needed in regards to launch weather criteria.
https://www.nasa.gov/content/artemis-i-weather-criteria
NASA TV will start around 2:30pm today with the fuel loading.