@ Akshu

More on your issue:-

Although, you have not mentioned clearly, your CG would take place on 20 SEPT 2025, which is in FY2025-26.

So, your CGAS account can be opened before the ITR Filing Date of AY2026-27, meaning till 14 Jul 2026.

And deposit the CG in the CGAS account only if you are unsuccessful in buying a property, since getting the deposited money out of CGAS is quite convoluted.