Investing in US equities is not available to Egyptian nationals residing in Egypt
If you own shares that are eligible to receive dividends they will be added to your Thndr account once they are given out. Fractional shares that you own may not receive dividends as this will depend on the size of your shares. For example, if the dividend you are eligible to receive is less than USD 0.01 then you won't be eligible to receive anything.
Dividends are subject to a withholding tax under US tax laws. As a foreign person, you are subject to a 30% tax on your dividends.
However, the US has tax treaties with several countries. If you are a resident of one of those countries, a lower withholding amount may be applicable.