TT has 50+ thumbnails of Keanu, Alex Winter, some of the time travelers and the phone booth on the Bill and Ted 3 set.
Just Jared has posted a gallery of 23 photos from the set
Update: Hollywood Pipeline has posted 18 photos from the series.
Update X2: The Daily Mail has a post up with 12 photos.
Update X3: TMZ has a post up with three photos.