run puppeteer on already installed chrome on macos

1.How can I run the Puppeteer script on the already installed chrome in mac machine. I tried with the following script, not able to run.

2.Is there any way to open the chrome window with particular window size here I am not talking about viewport, I tried with args "--app-shell-host-window-size=1600x1239" -- not working.

Could anyone help me on the above two issues. Thanks in advance for any help

const puppeteer = require('puppeteer');

(async() => {
    const browser = await puppeteer.launch({

        headless: false,
        executablePath: '/Applications/Google Chrome.app/',
        args: ["--app-shell-host-window-size=1600x1239"]


    });
    const page = await browser.newPage();
    await page.goto('http://localhost:8282/publisher/login' ,{
        waitUntil: 'load'
    });
    await page.screenshot({path: '../screenshots/cms-local.png'});

    //await browser.close();
})();

After Following the Eric Comment and jegadesh answer below, I changed the code like below and Now it is working except one small issue: window is opening in correct size but content in that window are constrained to some other size, see the screenshot below

Working Code:

const browser = await puppeteer.launch({

        headless: false,
        // executablePath: '/Applications/Google Chrome.app/',
        args: ["--window-size=2400,1239"]


    });

Regarding your first question, Puppeteer docs indicate that it could work with an installed version of Chromium or Chrome.

To use an installed version:

• set the environment variable PUPPETEER_SKIP_CHROMIUM_DOWNLOAD (https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#environment-variables)
• use the executablePath, as you have already pointed out.

Regarding your second question, use --window-size. For example: "--window-size=800,600"

Please be aware that if you have opened a browser window with an explicitly set window-size, then that size will be used for all future windows (ignoring any size you specify for the future windows). For a new window-size to be effective, you must close all previously opened windows.