This depends on the validity period you have selected. When your data bundle is finished, or your validity period has expired, your internet connection will stop working (we sent notifications through Whatsapp).
Your eSIM or SIM card however can still be used (a few days, or even a few months later) if you top up your data bundle with the link provided.
The validity period of your bundle starts counting from the moment your phone connects to the network.
So you can safely install your eSIM while you are still abroad, the validity period only starts counting when you connect to the network when you arrive.