Kids in School under H4, H1B expires in the middle of their school year

Me and My family have been in the US for 2 years on H1B visa (H4 for dependants), the H1B expires after they start their school year (November next year), what alternatives could we follow, in order for them to be able to finish the school year in the US (Finish Highschool)?
The current approval times by USCIS are very long,

File H1B and H4 extensions and then you can keep working in the US.