Is there a free app where i can maintain the ledger to track my own P&L for binance.sg?

I use Delta as well. On Binance SG you can look at your Buy/Sell history. From there you can add the transactions on to Delta. Also FYI - On some exchanges Delta has APIs which automatically import the transactions. But Binance SG isnt one of them

I use the portfolio feature on CoinGecko. Allows me to see the latest price, charts, and sentiments there as well.