It always impresses me when a parent takes such a big role in their child’s learning. Excellent job Mom! Your son knows all the basics to start. When my 4 ½ y/o started school and like your son was never in preschool or daycare, he knew all the basics, plus how to write his name.
What I did know was that he needed to know how to use scissors and cut in a straight line, was familiar with the days of the week and months of the year, etc., and know their name and address.
Most kids catch up with each other by the end of Kindergarten. Oh and PLEASE don't feel like your child is behind and don't compare him to others. Just hug an kiss him everyday =-)
Keep up the great work and have fun teaching him!