As it currently stands (assuming Wales dont suddenly collapse) these are the teams in the playoffs along with their finals fixtures)
Seeded
Serbia (Portugal (A))
Switzerland (Bulgaria (H))
Sweden (Spain (A))
Croatia (Russia (H))
Poland (Hungrary (H))
Scotland (Denmark (H))
Unseeded
Wales (Belgium (H))
Turkey (Montenegro (A))
Finland (France (H))
North Macedonia (Iceland (H))
Czech Republic (Estonia (H))
Austria (Nations league)
Serbia, Switzerland, Sweden, Croatia & Poland can still qualify automatically and are guaranteed a playoff spot.
If they all do Portugal, Spain, Italy, Russia, & England will take the playoff spots.
Wales & the Czech republic are guaranteed a playoff spot due to nations league but can still claim a seeded spot.
Finland need to match or better Ukraine's result to keep their spot likewise North Macedonia need to match Romania's result. Unlikely either of them will end up seeded.
Scotland beat the Danes and a seeded place is guaranteed.
Anything else means relying on Belgium, Estonia, & France doing Clarke & Co a favour.