1) Can we connect Journey Orchestration to Adobe Target? Use case: segment which has been created via AEP, create the workflow via Journey Orchestration and activated the segment in Adobe Target.
Technically, you could use the "Update Profile" action in JO to put the user into the segment you created by updating the fields that would qualify the person into the segment. See update profile documentation here -Jumping from one journey to another | Adobe Journey Orchestration. The timing of this segment realization follows the standard segment realization SLA's defined today and will play into your expectations for experience delivery.
Technically, you could use the "Update Profile" action in JO to put the user into the segment you created by updating the fields that would qualify the person into the segment. See update profile documentation here -Jumping from one journey to another | Adobe Journey Orchestration. The timing of this segment realization follows the standard segment realization SLA's defined today and will play into your expectations for experience delivery.