Can I witness the declarant's signature, and record my signature, at different times?
You should witness the declarant's signature, sign and complete the witness' sections and return the completed statutory declaration to the declarant in the same space of time.
This should be in the course of a single in-person visit or video call.
For remote witnessing over video link, the witness must see the declarant sign the form. They may need to ask the declarant to adjust the camera in order to do this.