The Bank can notify you when your DD gets encashed or you keep checking periodically.
PER - Positive Eligibility Review. It means you meet the minimum 67 points criteria and your application can be forwarded to your Visa Office for a VO to review and progress it.
You will generally receive your PER within 4 to 6 weeks of your DD being encashed. If you have specified an email - it will come via email.