Here is the latest guidance from USED as it relates to COVID and schools. It was released just now, in coordination with a broader update from CDC (attached and online here: https://www.cdc.gov/coronavirus/2019-ncov/downloads/community/schools-childcare/K-12-Operational-Strategy-2021-2-12.pdf)
AASA released a statement in response to the guidance: https://www.aasa.org/content.aspx?id=45340