Can Wireshark tell me the bandwidth being used by every device on my network?

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I would say, yes it can propably do it if you capture the entire network traffic.

But I can think of a number of reasons why it is not a sane decision.

1. How can you gather all network traffic?
2. Statistics are only usefull if you capture for a long time. That is serieus business, make no mistake about that.
3. Once capture you end up with lot's of data and wireshark will be dead slow.

I suggest you turn to the tools that are suited for the job. Check out: https://geekflare.com/best-netflow-an... to get some ideas.