dating again post-divorce, when do i drop the LS history bomb

divorced 18 months, started dating again, on the apps, doing the whole song and dance. the problem is my entire adult dating life was inside one marriage and that marriage was non-mono for the back half. i've never actually "dated" as a single person who has this history. half the women i match with seem pretty conventional, the other half are more open. i don't know whether to put it in my profile (feels like an over-share for a swipe) or just bring it up when it feels right (feels like ambushing them at month 3). is there an etiquette for this in the UK scene specifically... feel like an awkward teenager again at 47