That should be plenty of time.
Once the 820/801 application is paid for and submitted, he'll get a bridging visa A automatically so yes, he'll be able to stay in Australia with you.
Be sure to read the entire BVA grant letter for important information on visa conditions for things like travel.
The BVA won't go into effect until the 300 ends while he is still onshore.
Once the 820/801 application is paid for and submitted, he'll get a bridging visa A automatically so yes, he'll be able to stay in Australia with you.
Be sure to read the entire BVA grant letter for important information on visa conditions for things like travel.
The BVA won't go into effect until the 300 ends while he is still onshore.