poster sized print quality from x series?

I'm curious to hear from some of you who have made the switch from full frame to Fuji x series and have had large prints done from both.

Some back story for you: I've shot full frame my whole career, at one point or another with both Nikon and Canon. I still shoot all my professional work on my 5D Mark IV, but I'm very seriously considering switching over completely to the x-t4.

I own an x100F, at one point briefly owned and x-t2 and have recently rented the X-t4. I am IN LOVE with that camera and all things fuji. I love the size/weight, the color science (yes I shoot RAW, but the processing is so much faster/easier for me to reach the style I like) and the lenses blow my mind. The x line reminds me so much of my Contax G and T film cameras that I've always adored.

I'm considering buying the x-t4 this weekend and using it on a swim campaign I have booked next week. The only thing giving me pause is this is a longterm client of mine who regularly prints poster size for in-store ads, etc. and I want to make sure they're getting the same quality they're used to. Things to keep in mind: I'm not a landscape photographer. I'm not a pixel peeper and I definitely fall more in line with photographers who capture a moment or mood rather than extreme technical perfection. I've done lots of photoshoots with big pop stars on tiny little point and shoot film cameras, so I'm definitely not the dude with the magnifying glass.

I wouldn't be asking this question if it was for a magazine (I know it's good enough there). I wouldn't ask about billboards (it's good enough there, too). It's that in-between zone I'm curious about.

Someone give me the green light on this because I'm dying for that little x-t4 to be my moneymaker and best friend.

Thanks in advance for your thoughts!!