GST cut is only on selected categories, most of the pc electronics/mobiles were & still remain in 18% slab. For a typical person the most noticeable price cuts will be in appliances category especially TV, Fridge, AC, Washing Machine etc.
I don’t think this was ever in doubt anytime during any previous GIS sales.
Plan your purchases carefully & you will save money irrespective of whether there is a sale or not. For example, there was a very tempting offer on a certain mesh series router pack on flipkart but after researching for almost an hour I found out it was not worth getting even at that tempting price after almost placing the order a few hours ago.