It's not a problem, but that oil is pretty much as low quality as you can go.
The lifter noise will be the worst during the morning because the oil you put in doesn't handle low temperatures well.
The noise is that loud because the oil has been pushed out of the lifters by the spring pressure. Then when you start up, the oil is very viscous (because it is 20w50) so it takes a while for the oil to heat up and to pump up the valve lifters.
Next time use Shell Helix HX7 (10w40)