Your employer is not responsible for approving your claim; your employer's insurance company is.
If you have sustained a workplace injury, you should definitely inform your employer about it as soon as possible. It'll also be good to inform them of your decision to lodge a workers comp claim.
However, once you've lodged your claim with SIRA, the decision for approval lies with your employer's insurance company.
Insurance approval usually takes about 1-3 weeks.
Hence, your employer has no influence over the outcome of your workers comp claim.