Were the 39% measured in SLM? In this case, I would explicitly add that (e.g. "[...] that by the recent estimates provides up to 39% of yearly profit (measured in SLM)" [...]).

I think it's impossible to provide a profit figure in USD, BTC or other currencies, as we can't predict the price evolution. If SLM recovers from the dip caused by the recent large dump then it's likely that the profit for PoB or PoS minters buying SLM now could be much superior. But it can also the other way around.