He has not contacted me since then and I have not heard about my son either. I'm a little worried about what is happening with my son, but I do realise it is partly the need to control the situation from me, but I'm unsure whether I should check if my son is ok with him.
No contact does not apply to your children. You should be able to have contact with your son during the extended quarantine. I'd recommend calling or video chatting with him regularly during the week. You don't need to have a discussion with your husband, just have him hand the phone over to your son.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21