Apply H4EAD while H1B TO H4COS is Pending

My spouse is on H1 right now, expiring in Jan 2020 (6 years complete). We have applied for H1B to H4 COS a month ago with future date. I am waiting for my i140 approval .Can we apply H4-EAD while H4COS is in pending – before/after my i140 approval .

Appreciate your response

You can apply H4 EAD while H4 COS is pending.