TD1 while employed in two provinces?

[meech-27]

I’m filling out forms for a new casual job in BC, and I assume I would check the “more than one employer or payer at the same time” as I’m also keeping my current casual job in Alberta (planning to work both jobs)? I’ve worked for the AB employer consistently in 2023, getting “full time” hours as per the nature of the job and it’s scheduling, so would I enter 0 for this one? Then if I leave the AB job and am only working in BC I’d have to submit a new TD1?

Thanks!