Should I xfer HDV 1440x1080i to ProRes 1440x1080p for editing and internet?

Hello:
I still get a bit confused about Pro Res, etc. So if anyone can point me in the right direction on this I'd be thankful.
I shot HDV video at 1440 x 1080i (interlaced) as that's the format my old-ish Sony HVR-Z1U (already shot, looks great - that's the camera I had so no lectures).
My question is should I transfer it to ProRes 1440 x 1080p (progressive) for editing and later encoding as h264 video for the web? Is there any advantage to doing this and if so at what stage should I do it?
Should I do before the edit? After the edit (and before the h264 encode)? Or is it necessary to do it all?
Final output is internet only.
Thanks in advance for any help or pointers

Good information. Many thanks.
On the contradictory element... I have heard (and occasionally practiced) that bringing in the video from tape as ProRes speeds up the editing process (doesn't take so long to render, etc.). I'm all for keeping things as simple as possible and keeping things native would be best - but don't you find it takes up more drive space and takes longer to render?
My project will be 20 mins in length when completed, and does involve some green screen chroma keying - so I'm up for anything that does not need constant re-rendering (which has been an issue when working with native/uncompressed HDV video).
Thanks again.
A

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