Hi
Applied for 887 on 02/02/2017 online. As us3rOZ says, the website health assessment section says to hold off until they ask. I read somewhere that they may ask if you have travelled out of Australia for more than 4 weeks and also for some specific countries whatever the duration of visit may be.
@us3rOZ - when did you apply? have you been allocated a CO yet?
Regards,
Sue