Actually doing Siri Sukhmani Sahib before starting Abhyaas in the morning is very beneficial. Many Puratan Gursikhs used to do this Paath at Amritvela.
The Best amritvela consists of Sukhmani Sahib before starting naam abiyaas, but that is only if one wakes up at a time where they have enough time to do 1:30/2 hours of Naam Abiyaas in the morning.