Itemize inside Textblock inside Column

So this is the first time I’m using Beamer and I’d like to show the image first, than the first text, then the second one … etc
After many attempts, this is the best result I can get. The problem is that the second text is showing first then the first. as shown in the following picture. How can I fix that ?

documentclass{beamer}

usepackage[absolute,overlay]{textpos}

usetheme[sectionpage=none, progressbar=frametitle, numbering=fraction]{metropolis}

setbeamercolor{itemize item}{fg=white}

begin{document}

begin{frame}{Modélisation du système}
begin{columns}
onslide<2->{
column{0.5textwidth}
begin{textblock*}{60mm}(10mm,15mm)
begin{itemize}
item text 1 
pause 
item text 2
end{itemize}
end{textblock*}}
onslide<1->{
column{0.5textwidth}
includegraphics[width=textwidth]{example-image}
}
end{columns}

end{frame}

end{document}

documentclass{beamer}

usepackage{tikz}
usepackage[absolute,overlay]{textpos}
setbeamercolor{itemize item}{fg=white}

begin{document}

begin{frame}{Modélisation du système}
begin{columns}
column{0.5textwidth}

begin{textblock*}{60mm}(10mm,15mm)
pause
begin{itemize}
item<2-> text 1 
item<3-> text 2
end{itemize}
end{textblock*}

column{0.5textwidth}
includegraphics[width=textwidth]{example-image}
end{columns}

end{frame}

end{document}