As soon as your order is shipped, Colissimo will send you a confirmation email with a tracking number and a link to follow its delivery. For your information, it may happen that these emails arrive in your spam/junk mail.
You will receive an email and/or a notice in your mailbox from Colissimo indicating the place where you can pick up your package.
You can follow the status of your order directly via "My account", section "Order history". You will also receive an email when the status of your order will change. For your information, here are the different order statuses: "Payment accepted/pending for payment by check/pending for bank transfer", then "in preparation", "in delivery", and finally "delivered".