How long do I have to wait before I can get a new skin? I haven’t gotten any notification for being last stage but I’m at stage 8 currently.

For the new strains, they still haven't been added to the wardrobe by staff yet. Once they are, you should get a notification and then be able to take off your skin.

Hopefully I have enough time to get another few skins. 😅 Thanks for the info.

Don't worry, you still have time for three more skins :) And remember that your last skin will still progress after Survival is over as long as you are infected before the event ends.