Hi @Vivek_Negi,
Yes, the dates mentioned and the assumptions are correct. Income Tax Return filing and Advance Tax payment are two different concepts. While you file ITR after the PY 2022-23 ends till 31st July, Advance tax is the tax liability that you pay before the year ends. In case of 44ADA only one installment of Advance tax is applicable i.e 15th March where you pay the entire estimated tax liability in one go.
At the time of return filing the income will be calculated again and thus tax liability might differ from what you had determined earlier at the time of Advance tax payment. In case you have paid excess Advance Tax you will receive refund and in case of deficiency you will have to pay tax along with interest.
Hope this clarifies!