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Hi! I recently bought a Ficus Microcarpa from a nursery. The plant is big and pretty good, with strong aerial roots. I plan to shape and train it into a bonsai. So, should I go ahead a prune and wire it in the coming week(s) and repot into a bonsai pot in spring of 2022, or should I do something else. The plant has overgrown its current pot, with roots coming out of the holes. Also, many leaves of the plant have turned yellow (as is common with Ficus when introduced to a new place)

Hello, nice tree.

By the picture, it looks like a Ficus Panda or Green Island, but that doesn’t make much difference.

I would be thinking about build tapper and select roots, on propper season.

Hello! Thank you very much for replying.
I am sorry, I didn't get what you meant by build tapper and select roots. If you would be kind so as to explain to me in simple terms.
Also, I was more confused about it being a Ficus Regina, but by using a few apps and contacting a botanist friend of mine, I have established that there's a 70% chance that this is a Microcarpa, although even I have doubts of it being a Green Island

Well, I'm not goin into those variations labelling issues, even because it's not that important to your question.

Building trunk taper is to give the trunk a more conical shape, making it more proportional, in order to make a better illusion of an old tree...

Selecting the roots, is just as it means, pruning, removin or keeping roots in order to form a nice root base for your future 名媛直播. Research about nebari, and rootwork. But research a lot before doing it.

Trunk Taper ilustration

Source:

I am an idiot. I forgot what tapering meant even after researching about it yesterday. Thank you very much for explaining. I will have to repot the plant soon since it's getting root bound, and allow it to grow till spring for nice pruning
Thanks

Repot best time would be Late winter/Early spring, so until then you have some time to plan it.

Unless you live on a place that is warm the whole year...

I am in New Delhi. So harsh winters are yet to come (late Dec to late Jan). The min temp is already at 12°C, so maybe mid to late February is right (with temperatures at min of 11°C)
Is it fine to leave a plant which is root bound for a few months (especially after heavy pruning)?

Harsh winters with min 11 degrees . That really puts things into perspective.

Yes, the tree will survive your winter without repotting before.

During January and mid to late December, temperatures are 4-5°C at night and 8-10°C during day. with lowest temps in January going to 1-2°C for a few days. January is very cold as compared to Feb. The only issue for the Ficus is that it's root bound, so I am a little concerned if it would handle the winters, and any pruning done. Maybe I could prune it and a week later repot, all within November, before the mercury drops below 10°C

If the water is flowing, I think there's no issue about root bound, I would not prune or repot yet, maybe add a bit of substrate on top of the pot so it can have a bit more nutrients tru' watering...

Maybe on those colder weeks, you can put under a covered area, or big trees, but my Ficuses here takes 0?C nights without any covering and no problem.

It should be ok.