Copy tracking from private note to AST tracking widget

Currently my shipping service provider will auto update the order status from ‘processing’ to ‘completed’, and then add a private note to with tracking info “eg: Courier: 1233459112843”. So this will trigger the order completed email customized by Yaymail Pro which supposed to contain the tracking number using the widget from AST.

How do I:

1. Add a delay to send out the order completed email (so the tracking number have time to be updated).
2. Copy the tracking data from private note to AST tracking widget

So that after the shipping service provider ship the parcel, my customer will receive the order completed email that contain tracking data.

Thank you so much for the help.