Congrats for getting through.
Can you clarify, what the format is- case or skills assessment? Have you been through your case round already?
Sounds (as its final round) like this will be skills assessment i.e. PEI/Behavioural interview, they will be keen to understand mutual fit - what experience you can bring, your skills, why Deloitte, what transferrable Consulting skills you can bring etc. They may also dig into your background and experience in Tech in insurance- ERP transformation experience, insurance standards, industry trends and challenges.
All the best!