The UI 4 update is still under development stage for note 20 series in US according to TMB. So we in Canada won't see it until very early in 2022
Not talking about the Note 20 here.
S20 Ultra is on Beta 2, but we'll wait & see if we get Stable in Canada this month?
Pretty sure that Samsung is taking what it has learned from the S21 Ultra and applying any relevant fixes to the S20 Ultra Betas.