You're using the Pool Math app, right? It can track more than one pool, and there's more than one way to make use of that feature. Set up at least two "Pools," two sets of test data. One for your pool, and one for your source water (city or well?). You could even have a third for your fill water, after the softener, after it is connected.
Do the full set of tests regularly for your pool and record them in Pool Math, in the "Your Pool" pool data set. That'll be your normal day-to-day, week-to-week test results to help you determine the proper dosing of chemicals.
Then do a partial set of tests for your source water. And again for your softened water. Record each in their own Pool Math pool. This will give you some data for comparison over time, to see how both your source water might change, and how your softener output might change. If you're super curious, you could test your source a few times a year, at least at first. My municipality changes its water source by the seasons, one from a local lake, the other from ground water, maybe even mixing the two sometimes. The chemistries are very different, and affect my strategy for exchanging water (as one has significantly more CH in it). These tests would help you determine if your source and fill water is chemically stable or not, and so help you form your own strategies.
You only need to test a few things for the source and fill. CH mainly. pH if you're having pH issues in your pool. TA if you're having TA issues. Salt if you're curious, but it's not really critical, as your pool is going to gain salt no matter what. You don't need to test for CYA, there won't be any. FC would probably be too low to be of use, and wouldn't affect your day-to-day maintenance anyway, so you don't need to test FC for your source or fill water.
These extra sets of data will give you a good baseline, to help you (and us) determine what is going on with your water and how to correct it when necessary.
It's also a great way to practice with your new kit at first.
PS. After the first few tests, you're going to say "Gee, they were sure right about that SpeedStir!" Have fun.