It should be realtime. May i inquire if it's really a GBC? As some third party stores claiming to be globe stores but in reality they are just authorized distributors accepting payments which will be posted on the following days.
Better go back at that gbc where you made your payment. Or call 211 and request for posting by sending your OR No.
Or scan/picture your OR and email it to firstname.lastname@example.org , with email subject as payment posting.