Glad to have you here in the Community. Allow me to help share some information about the availability of the updated form 941 in QuickBooks Online.
In line with our aim that no one gets behind with tax updates, QuickBooks will release the updated form 941 as early as April 01, 2019. This is to ensure that QuickBooks releases the most recent updates from the IRS.
To get more information about filing forms in QuickBooks, you may check out this article for your future reference: File quarterly tax forms.
This information should get you moving today.
Please let me know if you need ant other questions with tax updates or anything about QuickBooks. I'll be around to help you out. Have a good one!