Present company applied for H1B and being selected for dream job in another company, what to do ?

The present company applied for H1B and received mail from present company. In the mean time I have been selected for Final round of Interview by another company and may get through. What action to be taken and how long may take to decide about H1B under Masters degree of US quota.

It would be difficult to answer that question without you providing information regarding your current status and the expiration date.