Does touringplan.com have a pre-made one day plan for visiting both Harry Park at Universal?
Not exactly. Any one plan can only deal with one park at a time. You have to make a half-day plan for each park. This site has several one-day/two-parks plans - with a Part 1 for the first park and a Part 2 for the second one. https://touringplans.com/universal-studios-florida/touring-plans/adults. It has a link to a Wizarding World plan, but only one part. You can search to find the right plans. Part 1 is at https://touringplans.com/plans/1144171. Part 2 is at https://touringplans.com/plans/1144177.