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In that case, use cement as a replacement mortar but the advice remains the same and as mentioned in an earlier reply - sandy mortar will soak up water and allow it to penetrate onto the cavity wall insulation. So in answer to your original question, you need to do the pointing if you are going...

I disagree with the above, the mortar is lime and has reached it's end of life it is sandy and brushes out easily. If you didn't have cavity wall insulation (CWI) you could delay a little longer but utlimately it needs doing and you want to avoid the CWI getting wet at all costs as this will...

The simple answer is to wait and see rather than pre-empt an answer but usually you can see the final colour by looking at the small areas that are drying first. Lime does cure and dry slowly and starts off a lot darker than the final colour so you will have to wait until fully dry but I can...