Depends on a few things. First, did you hit your FG? If you can wait, you really want to hit your FG and give it 3-4 days of rest before removing any of the beer. The rest allows the yeast to settle out and clean-up any byproducts (e.g. diacetyl) before being separated from the beer. My practice is 2 weeks primary, 4 weeks secondary - take several gravity readings along the way to be sure.
Assuming you hit that, you can transfer. The risk of oxygenation exists, but it is not severe; you likely have some CO2 in suspension that continues to leave the beer and will re-form the protective CO2 layer in the carboy. You should be fine. Hope it turns out well!
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