Max out my Roth and HSA now but invest weekly to DCA throughout the year?

I have enough cash to max out my Roth and HSA contributions for 2026. I've never considered doing this before but it makes sense to me to transfer the money that I have in a money market fund in a taxable account into my Roth and HSA now, but hold it in the MMF and gradually invest it every week like I have been doing for many years. This way I avoid the taxes in my taxable account and still DCA throughout the year. Is this a common strategy for those with the cash to do it or do they just invest it all right away?