Hello leep67941422,
The 48hours delay is just in the reporting but trait/segment realizations are updated in backend.
If you wish to capture data via Analytics, sent it to AAM with Server Side Forwarding and targeting users in real-time using this information present in AAM then you can do this.
There will not be any delay in terms of realizations, it's the reporting delay of 48 hours.
If you wish us to further debug this, please reach out to us via amsupport@adobe.com with the details about your account, launch property, website with replication steps to qualify for any trait/segment and test credentials. We will try our best to help you in capturing data in AAM via Server Side Forwarding.