Yeah exactly. For more accurate data you want to have a CTA like "get the product" and then a page where you explain that you are still working on it to put it

Yeah exactly. For more accurate data you want to have a CTA like "get the product" and then a page where you explain that you are still working on it to put it out there ASAP. This way the conversion rate can be directly used to your future calculations. If you use words like "beta" or "waiting list" it can corrupt your data. And to answer the previous comment : if a user/consumer have the reaction "Thank god someone have resolved my issue", then finding that you'll have to wait is not really a big of a deal. For example a few years back I found this device to scan your food and have sorted the ingredients. As a coeliac it had huge value for me. When I clicked on the CTA I found that they were still "in development", well, can't blame them to work on it, let me know when it's available. I was a bit disapointed but still exited someone was working to resolve my problem !