Short answer: no.
Agreements reached in mediation are not legally binding. They rely on you both holding up your end of the agreement.
You can make mediated agreements legally binding by completing a Consent Orders application form and lodging with the court. It costs about $165. You could do the application yourself, but it’s fairly complicated and you might find the assistance of a solicitor helpful.
We strongly advise getting independent legal advice before signing a Consent Orders application for parenting or financial.