Hi Mia,
Yes, it is too early to delete your dating apps. Try not to get too carried away with the fact that you have both been on 3 dates and about to go on a 4th. Instead, make sure that you find out about what he is looking for before you start becoming too emotionally attached.
Date 4 is a good time to bring up the topic of what he is looking for and go into more detail about it. You both need to be on the same page in terms of what you are both looking for. Don’t make assumptions that he wants the same thing. Get clear on this.
If you are both on the same page, it will be a lot easier for the both of you to determine when would be the appropriate time to mutually delete your dating apps.