Right now, only mail not delivered to the inbox reports the spam weight in logs, but I recommend it should show scores for regularly delivered mail as well (messages that did not score higher than SPAM LOW scores).
[2018.04.24] 05:30:56 [30307] Delivery for CBPJS6T3JSG51GV5CNGL6G4BG39NNAQCG3169Q8VV8G@bounce.pennstateind.com to jroyj@hereandnow.net has completed (Delivered) Filter: None
Already, it provides the Weight for every other message which did not make it to the inbox.
[2018.04.24] 07:24:10 [16442] Delivery for Good&badposture:@posturetips.bid to salljsue@hereandnow.net has completed (Deleted) Filter: Spam (Weight: 40), Action (Global Level): Delete
[2018.04.24] 05:35:00 [30498] Delivery for dr_tinnitus_md-pabsld=megalink.net@onsitesonar.com to pjbsld@hereandnow.net has completed (Deleted) Filter: Spam (Weight: 40), Action (Global Level): Delete