Yes, it's checking.  I have it  enabled in DELIVERY, and SMTP - it does not show up in SMTP unless it's a fail it seems...  

For example this message failed on GBUDB but it did not give any detail on pass or fail for other checks.  And I have logging set to detailed.
[217.182.239.250][35955892] Mail rejected due to SMTP Spam Blocking: GBUDB (30,failed)

This is DELIVERY, which shows everything.

[2019.04.05] 00:51:04.644 [70671] Spam check results: [BARRACUDA: 0,passed], [SPAMCOP: 0,passed], [GBUDB: 0,passed], [HOSTKARMA-BLACK: 0,passed], [MCAFEE: 0,passed], [SURRIEL: 0,passed], [ZEN2: 0,passed], [_MESSAGESNIFFER: 0,code:0], [_INTERNALSPAMASSASSIN: 2:3], [_SPF: 0,None], [_DK: 0,None], [_DKIM: -2,Pass], [ZEN10: 0,passed], [ZEN5: 0,passed], [ZEN4: 0,passed], [ZEN11: 0,passed], [BACKSCATTER: 0,passed], [IX: 0,passed], [HOSTKARMA-YELLOW: 0,passed], [ZEN6: 0,passed], [ZEN7: 0,passed], [ZEN9: 0,passed], [ZEN3: 0,passed], [UCEPROTECT3: 0,passed], [UCEPROTECT2: 0,passed], [UCEPROTECT1: 0,passed], [MSRBL: 0,passed], [SEM-BS: 0,passed], [SEM-BL: 0,passed], [SENDERSCORE: 0,passed], [SPAMRATS: 0,passed], [UBL: 0,passed], [BONDEDSENDER: 0,passed], [IADB: 0,passed], [MAILSPIKE-L5: 0,passed], [MAILSPIKE-L4: 0,passed], [MAILSPIKE-L3: 0,passed], [MAILSPIKE-L2: 0,passed], [MAILSPIKE-L1: 0,passed], [MAILSPIKE-H1: 0,passed], [MAILSPIKE-H2: 0,passed], [MAILSPIKE-H3: 0,passed], [MAILSPIKE-H5: 0,passed], [MAILSPIKE-H4: 0,passed], [SURBL8: 0,passed], [SURBL16: 0,passed], [SURBL128: 0,passed], [SURBL64: 0,passed], [DNSBL: 0,passed], [URIBL-BLACK: 0,passed], [SEM-URIBL: 0,passed], [SEM-URIRED: 0,passed], [URIBL-WHITE: 0,passed], [URIBL-GREY: 0,passed], [CBL: 0,passed]