It is not possible to upload the invoice in the approved status.
For invoice approval, the import program looks at the setup options will determine whether approval is required. If it is required, then the invoices upload with approval required. then need to create a custom update after upload the data to change the approval flag.
For invoice validation, (some people call this approval), the validation process calculates tax and creates accounting events, so again, there is no way to upload the invoices as already validated.