Continuity mistake: It's Friday when Georges comes by to spend the weekend with Brontë; when he arrives, it's sunset. (We can tell by the color of the sky.) Then they're at the grocery store and it's magically lunchtime, because Lauren comes back to the apartment and Brontë's angry that Georges invited Lauren to stay "for lunch."
Plot hole: Georges repeatedly tells immigration officers about his Africa trips. This overlooks that fact that INS would have or request a copy of his passport to process his case. In real life, INS would have realised immediately that the Africa story was not real: no entry/departure stamps in his passport.
Answer: It's implied she will be coming with him when George says he will write to ask 'when are you coming cherie?' and the way they laugh and exchange rings. She just has to wrap up loose ends in NY then she'll be on her way to him.