I-94 how many day will take update the information on line

HI

I have H4 visa I am planning to come usa on March 29th .when can i get I-94 Document on online.bcz my i am palnning to apply H1-B on April 1st.

Can i get the document by that time in online

It may take about a week (max). So, it’s quite difficult to say if it can be updated by Apr 1. Moreover you may not need i94 to file H1…