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the Psalter is used over 4 weeks, then restarts. In ordinary time, strictly the only propers are for sunday, so you refer to them on sunday for those few propers that are needed. for Mon-Sat, use the 4 week psalter exclusively, unless there is a holy day or a saint you wish to have a memorial for. For OT, even 95% of sunday is in the psalter (we ignore the sunday propers there is so little)

This week is 19th in ordinary time, so the Psalter is on week 3. Next week is 20th, ergo week 4 of psalter. Next week 21, ergo week 1 of psalter....you get the pic?

Advent: Has readings and intercession in propers but uses psalms of ordinary time. If you have DSP, it does spell it out. Week one of advent resets the Psalter at week one (even if the previous week, say week 33 of OT was week one)