I have below question


My husband is on H1B and recently had change in client location and got the LCA approved. He is planning to visit India this month and but H1B Amendment is under processing.While in India he has plans to get her H1 Visa stamped as it expired last year 2015 but he has visa till 2018 April as per new petition which he got when his visa was extended in 2015.His passport is not stamped.
Note : His visa is not stamped for April 2018 .

1. How long would it take to process H1B Amendment - Regular
2. Is it OK for him to travel with H1B Amendment filing Receipt and not wait for actual approval?
4. Would there be any anticipated issues in Visa Interview or in POE, while returning back.

Please Help.