Hello,
Do contact Support regarding it as well. Which side is faster depends so best to contact Support while waiting here.
My personal advise would be just wait out the 3 days since you already waited 2 days after giving the item if the buyer doesn’t reply to prevent unnecessary bad ratings in the future. There will always be people like the buyer so it is best to just leave 1 message kindly telling them to complete transaction after giving item. If they don’t reply, just wait out the 3 days as mentioned.