Log in to MyAccount at www.globe.com.ph/myaccount.
From the Account List page, select your Postpaid account and then click on the "Manage Account" button.
That takes you to your Account Dashboard. Scroll down slightly and you'll come across the portion showing your plan details (highlighted below).
This shows you the plan you're currently subscribed to, your plan's credit limit, your bill cut-of date, your contract duration and expiry, plus your last payment date and amount.