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Chrome Extension JavaScript not inserting value into paragraph tag

Hi there I'm learning how to create a v3 chrome extension and I'm having an issue inserting text into a paragraph I have tried inserting a document.getelementbyid that doesn't seem to work I have also tried using a document.body.innerHTML that did work but it displayed the value on the body of the page and not the chrome extension body

Manifest.JSON

{
    "manifest_version": 3,
    "name": "Stader HBAR Staking",
    "version": "0.1",
    "action": {
        "16": "/images/HBARLogo.png",
        "48": "/images/HBARLogo.png",
        "128": "/images/HBARLogo.png",
        "default_popup": "popup.html"
    },
    "description": "This extention works with Stader Hedera staking to get the amount of reward you have recieved so far.",
    "icons": {
        "16": "/images/HBARLogo.png",
        "48": "/images/HBARLogo.png",
        "128": "/images/HBARLogo.png"
    },
    "content_scripts": [
        {
          "matches": ["https://hedera.staderlabs.com/lt-pools"],
          "css": ["style.css"],
          "js": ["background.js"]
        }
      ]
}

Javascript File

    setTimeout(function (){
      let amount = document.querySelector(".bg-dark-600 > .flex > .flex-center > .LSPoolsEstimate_value__jdEKi").innerHTML;
      let currentAmount = document.querySelector(".MuiGrid-root > .flex-center > .LSPoolsForm_root__XqBrI > .LSPoolsForm_container__hcfZ2 > .LSPoolsFormLaToLx_root__DP9bV > form > .LSPoolsFormLaToLx_available_amount_validation__jOOGH > .flex:nth-child(2) > .Typography_root__nvhLo").innerHTML;
      removingFirstItem = currentAmount.split("~").pop();
      removingSecondItem = removingFirstItem.split("HBAR").shift();
      currentValue = removingSecondItem.trim();
      
      
      console.log(amount);
      let doCalculation = amount * currentValue;
      console.log(doCalculation);

      let youHaveEarned = doCalculation - amount;
      console.log(youHaveEarned);
      document.getElementById("initialAmount").innerHTML = totalAmountEarned

    }, 2000)();

HTML File

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="bodyofex">
      <p id="initialAmount"></p>
    </div>

    <script src="./background.js">
    </script>
  </body>
</html>
about 4 years ago · Juan Pablo Isaza
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