ばかり has a number of grammatical usages in Japanese, but one of the most common is with the simple past tense to express that an action has just taken place.
|【Verb: Simple Past】ばかり|
|The film has just started.|
|I’ve just returned home from work so I’ll make dinner have I’ve changed.|
|Despite having only just got his driving license he seems to think he’s Schumacher.|
|When the war had just finished, everyday life was difficult.|
|To feel like old friends despite having only just met last week.|
The structure is typically used in conversation rather than formal writing where very often a bridging っ will be inserted in the pronunciation to put emphasis on the か.
|ばかり ⇒ ばっかり|
|The test finished just now.|