Biggest of BRICS currencies is CNY and it's irrelevant at global scale.
If they start backing it with gold, silver, BTC and oil, it will be the most relevant. With the SWIFT system being shut out of BRICS or becoming just another choice for transfers, I think the dollar will be toast and all the treasury bills dumped like hot potatoes.
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If they start backing it
They won't.
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OK, I take your word for it, not theirs.
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theirs
Has there been promises about unified currency backed by something?
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Not yet. However those countries have been buying gold and have the commodities to commodify their currency.
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Doesn't mean they will.
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It, also, doesn’t mean they won’t.
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Common sense says it's less likely they will than they won't.