h4 travel while h1 extension is under process


I am on H1b and it will expire on Nov 2017, I have applied for extension and got receipt number. My spouse had H4 visa till Nov 2017 but we didn’t apply extension for him along with me. Now my questions are

Can he travel to US now ?If he travels when I can apply extension for him? Do I need to apply extension for him only after I get approval of my H1B extension?.If so, Can he stay with out applying extension after Nov 2017Please suggest me.

Dependent extensions must always be filed alongside primary applications. It is more convenient and decisions are easier to grant because USCIS already has the primary case file open instead of them having to return to it at later date. Regarding the question of your husband staying in US after November 2017, yes that is okay as long as an application is in process or pending.