Up to how many weeks can employer ask the employee to go for maternity before delivery?

Up to how many weeks can employer ask the employee to go for maternity before delivery? Can employer ask the employee to go for unpaid leave before the delivery due to operation needs?

Employee can consume her maternity leave 4 weeks before the delivery date and the rest of maternity leave (4 weeks or 8 weeks, depends on eligibility) after the delivery.

Under normal circumstances, employer cannot ask the employee to go for their no-pay leave. Employer shall re-deploy the employee to other work area instead.