Splitting a hosta is a straight forward process.
You don't need to separate it now, or ever really. If you don't separate it, There's no telling what will come up in the spring. It could all look like the 'original', all like the sport, or remain as a combination. It's totally up to you.
Yes, you can separate it in the spring. But to do so, you will need to wait until you have leaves out from all of the eyes so that you can tell where to split.
Hosta are best planted in the spring and/or fall so that they have time to put out new roots before the heat of summer or cold of winter get ugly.
Here are several references that show you how to divide a hosta.
HostasDirect
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https://youtu.be/cOELV5cNteg
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https://www.hostasdirect.com/l...
NH Hostats
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http://www.nhhostas.com/dividi...
