Yes, I think that's fairly typical, sitting or lying down puts far less strain on the bladder muscle than standing up. Certainly was my experience. I was dry at night from day one.
Last few months post-op have been a bit of a blur and improvements have been gradual but I think about 6 weeks after catheter removal I was at 3 pads, down to 2 pads about a fortnight later. I have good days, then sometimes a bit of a wobble another day, particularly if I'm busy, distracted or tired (or perhaps all three? 😴 )
I think you're about a month post operation so try not to let it get you down. You will get there. Sounds like the catheter idea might work for you, particularly if it buys you a bit of freedom.
I may have mentioned before, keep doing the pelvic floor exercises as they really do seem to help.
Hope this helps