Hi Govant,
For a workstation type laptop (such as the Lenovo P53) the best available graphics cards are the Quadro RTX4000, Quadro RTX5000 and Quadro RTX6000 (latter not available for the P53).
You might also want to check out high end gaming laptops from Razer (
www.razer.com). They work very well with Metashape and RAM can be upgraded if needed (you can replace the RAM modules yourself). The
Razer Blade 15 comes with the latest (10th) generation 8 core Intel i7-10875H CPU (16 threads) and a NVIDIA RTX 2080 Super graphics card. All very powerful / latest generation components. Big plus: it's all packed into a sleek/compact and portable machine at just over 2kg total weight (no heavy 'monster' gaming laptop).
All the best.
Regards,
SAV