Have you reached a binding property settlement with your ex husband?
I assume you have not... and if that is the case.. then Yes, your husband could make a claim when the property settlement is eventually completed.
It is best to obtain your binding property settlement first... you do not have to wait until after the divorce is finalised.. it can be done anytime from the date of separation.. there is a time limit of 12 month after divorce, after which you need to obtain the permission of the Court and explain the delay... before an application can proceed in the Court.
If you both agree.. you can obtain a BFA - Binding Financial Agreement outside of Court... but you must first both obtain a certificate of independent legal advice, prior to signing.
If you both agree, a cheaper alternative, is to agree to and lodge consent property settlement orders for the approval of the Court.
If there is a dispute.. please read the following Court prescribed brochure for more information about the Court process.