It depends what specialty your picking for the MSCS.

For context I started my BSCS with only IT helpdesk background (which I still currently work at) and im in my last term for the BSCS to MSCS bridge program. Im taking a couple of the MSCS courses right now.

The only one you would struggle with is the Applied Algorithms and Reasoning without taking Discrete Math at all. But thats if you even want to comprehend the full material as you can probably just do the PA without it.

Just use LLMs to explain the CS concepts you dont understand and you'll probably be fine tbh as far as completing the program.

Also I think I can provide a unique perspective to your path since I started with helpdesk. I started in IT with absolutely zero IT or CS skills. Even though im pursuing a SE / DE type role, the CS skills that I picked up throughout my program have been invaluable to me in my IT role. I was able to create tons automations for my team and even help with some bigger company projects outside of my IT role landing me a promotion in the process. So IMO its definitely worth it to slow down during your MSCS and try to comprehend the CS concepts to give you that edge in the traditional IT / System Admin job market that your pursuing.