Yes! Cancelling only affects future renewals so any boxes that have already been paid for at time of cancellation will still be shipped. You will receive this month’s box (or any boxes left in your 3-Month or 6-Month plan) but your subscription won’t renew in the future.
If you do wish to receive more OwlCrates later on, remember you can just log into your account and reactivate your subscription. No need to start a new one.